DEFINED ASSET FUNDS MUNICIPAL DEFINED FUND
S-6/A, 1998-08-04
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<PAGE>
   
     AS FILED WITH THE SECURITIES AND EXCHANGE COMMISSION ON AUGUST 4, 1998
    
 
                                                      REGISTRATION NO. 333-58397
- --------------------------------------------------------------------------------
- --------------------------------------------------------------------------------
 
                       SECURITIES AND EXCHANGE COMMISSION
 
                             WASHINGTON, D.C. 20549
 
                   ------------------------------------------
   
 
                                 AMENDMENT NO 2
                                       TO
                                    FORM S-6
    
 
                   ------------------------------------------
 
                   FOR REGISTRATION UNDER THE SECURITIES ACT
                    OF 1933 OF SECURITIES OF UNIT INVESTMENT
                        TRUSTS REGISTERED ON FORM N-8B-2
 
                   ------------------------------------------
 
A. EXACT NAME OF TRUST:
                              DEFINED ASSET FUNDS
                             MUNICIPAL DEFINED FUND
 
B. NAME OF DEPOSITOR:
 
                   MERRILL LYNCH, PIERCE, FENNER & SMITH INC.
                               SMITH BARNEY INC.
                            PAINEWEBBER INCORPORATED
                           DEAN WITTER REYNOLDS INC.
 
C. COMPLETE ADDRESSES OF DEPOSITORS' PRINCIPAL EXECUTIVE OFFICES:
 

 MERRILL LYNCH, PIERCE,
        FENNER &
   SMITH INCORPORATED
  UNIT INVESTMENT TRUST
        DIVISION
      P.O. BOX 9051
PRINCETON, NJ 08543-9051                          PAINEWEBBER INCORPORATED
                                                     1285 AVENUE OF THE
                                                          AMERICAS
                                                     NEW YORK, NY 10019
 
    SMITH BARNEY INC.
      388 GREENWICH
   STREET--23RD FLOOR
   NEW YORK, NY 10013
                                                  DEAN WITTER REYNOLDS INC.
                                                       TWO WORLD TRADE
                                                     CENTER--59TH FLOOR
                                                     NEW YORK, NY 10048

 
D. NAMES AND COMPLETE ADDRESSES OF AGENTS FOR SERVICE:
 

  TERESA KONCICK, ESQ.
      P.O. BOX 9051
PRINCETON, NJ 08543-9051                              ROBERT E. HOLLEY
                                                      1200 HARBOR BLVD.
                                                     WEEHAWKEN, NJ 07087
 
                                COPIES TO:           DOUGLAS LOWE, ESQ.
                          PIERRE DE SAINT PHALLE, DEAN WITTER REYNOLDS INC.
   LAURIE A. HESSLEIN              ESQ.                TWO WORLD TRADE
  388 GREENWICH STREET     450 LEXINGTON AVENUE      CENTER--59TH FLOOR
   NEW YORK, NY 10013       NEW YORK, NY 10017       NEW YORK, NY 10048

 
E. TITLE OF SECURITIES BEING REGISTERED:
 
  An indefinite number of Units of Beneficial Interest pursuant to Rule 24f-2
       promulgated under the Investment Company Act of 1940, as amended.
 
F. APPROXIMATE DATE OF PROPOSED SALE TO PUBLIC:
 
 As soon as practicable after the effective date of the Registration Statement.
 
THE REGISTRANT HEREBY AMENDS THIS REGISTRATION STATEMENT ON SUCH DATE OR DATES
AS MAY BE NECESSARY TO DELAY ITS EFFECTIVE DATE UNTIL THE REGISTRANT SHALL FILE
A FURTHER AMENDMENT WHICH SPECFICALLY STATES THAT, THIS REGISTRATION STATEMENT
SHALL HEREAFTER BECOME EFFECTIVE IN ACCORDANCE WITH SECTION 8(a) OF THE
SECURITIES ACT OF 1933 OR ON SUCH DATE AS THE COMMISSION, ACTING PURSUANT TO
SAID SECTION 8(a), MAY DETERMINE.
 
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<PAGE>

   
       SUBJECT TO COMPLETION, PRELIMINARY PROSPECTUS DATED AUGUST 4, 1998
    
 
                                    DEFINED ASSET FUNDSSM
- --------------------------------------------------------------------------------
 

                              MUNICIPAL DEFINED FUND
                              (A UNIT INVESTMENT TRUST)
                              O   PORTFOLIO OF LONG TERM MUNICIPAL BONDS
   
    
                              O   DESIGNED FOR FEDERALLY TAX-FREE INCOME
                              O   DISTRIBUTIONS TWICE A YEAR

 

[LOGO]
Merrill Lynch,                 -------------------------------------------------
Pierce, Fenner & Smith         The Securities and Exchange Commission has not
Incorporated                   approved or disapproved these Securities or
Defined Asset Funds            passed upon the adequacy of this prospectus. Any
P.O. Box 9051                  representation to the contrary is a criminal
Princeton, N.J. 08543-9051     offense.
(609) 282-8500                 Prospectus dated           , 1998.

 
<PAGE>
INFORMATION CONTAINED HEREIN IS SUBJECT TO COMPLETION OR AMENDMENT. A
REGISTRATION STATEMENT RELATING TO THESE SECURITIES HAS BEEN FILED WITH THE
SECURITIES AND EXCHANGE COMMISSION. THESE SECURITIES MAY NOT BE SOLD NOR MAY
OFFERS TO BUY BE ACCEPTED PRIOR TO THE TIME THE REGISTRATION STATEMENT BECOMES
EFFECTIVE. THIS PROSPECTUS SHALL NOT CONSTITUTE AN OFFER TO SELL OR THE
SOLICITATION OF AN OFFER TO BUY NOR SHALL THERE BE ANY SALE OF THESE SECURITIES
IN ANY STATE IN WHICH SUCH OFFER, SOLICITATION OR SALE WOULD BE UNLAWFUL PRIOR
TO REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF ANY STATE.
<PAGE>
- --------------------------------------------------------------------------------
 
Defined Asset FundsSM
For more than 25 years, Defined Asset FundsSM has been a leader in unit
investment trust research and product innovation. Our family of 'DefinedSM'
Funds helps investors work toward their financial goals with a full range of
quality investments, including municipal, corporate, government and
international bond portfolios, as well as domestic and international equity
portfolios.
 
Defined Asset Funds offer a number of advantages:
   o Fixed portfolio: Defined Funds follow a buy and hold investment strategy;
     funds are not managed and portfolio changes are limited.
o Preselected Portfolios: We choose the stocks and bonds in advance, so you know
  what you're investing in.
o Professional research: Our dedicated research team seeks out stocks or bonds
      appropriate for a particular fund's objectives.
o Ongoing supervision: We monitor each portfolio on an ongoing basis.
No matter what your investment goals, tolerance for risk or time horizon,
there's a Defined Asset Fund that suits your investment style. Your financial
professional can help you select a Defined Asset Fund that works best for your
investment portfolio.
 

CONTENTS
                                                                PAGE
                                                          -----------
Municipal Defined Fund Portfolio........................           3
Risk/Return Summary.....................................           4
What You Can Expect From Your Investment................           7
   Income Twice A Year..................................           7
   Return Figures.......................................           7
   Records and Reports..................................           7
The Risks You Face......................................           8
   Interest Rate Risk...................................           8
   Call Risk............................................           8
   Reduced Diversification Risk.........................           8
   Liquidity Risk.......................................           8
   Concentration Risk...................................           8
   Bond Quality Risk....................................           8
   Insurance Related Risk...............................           8
   Litigation and Legislation Risks.....................           9
Selling or Exchanging Units.............................           9
   Sponsors' Secondary Market...........................           9
   Selling Units to the Trustee.........................           9
   Exchange Option......................................          10
How The Fund Works......................................          11
   Pricing..............................................          11
   Evaluations..........................................          11
   Income...............................................          11
   Expenses.............................................          11
   Portfolio Changes....................................          12
   Fund Termination.....................................          12
   Certificates.........................................          13
   Trust Indenture......................................          13
   Legal Opinion........................................          14
   Auditors.............................................          14
   Sponsors.............................................          14
   Trustee..............................................          14
   Underwriters' and Sponsors' Profits..................          14
   Public Distribution..................................          15
   Code of Ethics.......................................          15
Taxes...................................................          15
Supplemental Information................................          17
Financial Statements....................................          18
   Report of Independent Accountants....................          18
   Statement of Condition...............................          18

 
                                       2
<PAGE>
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                        MUNICIPAL DEFINED FUND PORTFOLIO
- --------------------------------------------------------------------------------
 
<TABLE><CAPTION>

                                                                              RATING              COST
PORTFOLIO TITLE (1)                              COUPON       MATURITY     OF ISSUES (2)      TO FUND (3)
- --------------------------------------------------------------------------------------------------------------
<S>                                              <C>          <C>          <C>                <C>

AIRPORT/PORTS/HIGHWAYS (      %):
1.                                                       %

 
HOSPITALS/HEALTH CARE (      %):
 

2. $
3. $
4. $
5.
6.

 
HOUSING (      %):
 

7.
$
8.
9.

 
INDUSTRIAL DEVELOPMENT (      %):
 

10.
$

 
LEASE RENTAL APPROPRIATION (      %):
 

11.
$
12.

 
SPECIAL TAX (      %):
 

13.
$

 
MISCELLANEOUS (      %):
 

14.
$
15.
                                                                                          --------------------
                                                                                          --------------------
                                                                                          --------------------


</TABLE>
 
- ------------------------------------
(1)  Approximately    % of the bonds are callable beginning in 20   .
(2)  All ratings are by Standard & Poor's Ratings Group unless followed by
     '(m)', which indiciates a Moody's Investors Service rating or by '(f)',
     which indicates a Fitch Investors Service rating. Ratings A through AAA
     indicate good to highest quality bonds with a strong to very strong
     capacity to pay interest and repay principal. Moody's and Fitch ratings
     have been furnished by the Evaluator but not confirmed with Moody's or
     Fitch. Bonds designated by 'NR' are not rated but in the opinion of the
     agent for the Sponsors have similar credit quality to other bonds in the
     portfolio.
(3)  Approximately    % of the bonds were deposited at a premium,    % at par
     and    % at a discount from par. Sponsors' profit on deposit was
     $            .
(4)  The interest and principal on these bonds will be used to pay the deferred
     sales charge obligations of the investors, and these amounts are not
     included in the calculation of Estimated Current and Long Term Returns.
 
                                       3
<PAGE>
- --------------------------------------------------------------------------------
 
RISK/RETURN SUMMARY
 

       1.  WHAT IS THE FUND'S OBJECTIVE?
           The Fund seeks interest income that is exempt from regular
           federal income taxes by investing in a fixed portfolio of
           primarily 15-to 30-year municipal revenue bonds.
       2.  WHAT ARE MUNICIPAL REVENUE BONDS?
           Municipal revenue bonds are bonds issued by states,
           municipalities and public authorities to finance the cost
           of buying, building or improving various projects intended
           to generate revenue, such as airports, health care
           facilities, housing and municipal electric, water and sewer
           utilities. Generally, payments on these bonds depend solely
           on the revenues generated by the projects, excise taxes or
           state appropriations, and are not backed by the
           government's taxing power.
       3.  WHAT IS THE FUND'S INVESTMENT STRATEGY?
        O  The Fund plans to hold to maturity    long-term tax-exempt
           municipal bonds with an aggregate face amount of $
           million, and some short-term bonds reserved to pay the
           deferred sales charge. The Fund is a unit investment trust
           which means that, unlike a mutual fund, the Fund's
           portfolio is not managed.
        o  The bonds are rated A or better by Standard & Poor's,
           Moody's or Fitch or in the opinion of the agent for the
           Sponsors have similar credit quality to other bonds in the
           portfolio.
        o  Most of the bonds cannot be called for several years, and
           after that they can be called at a premium declining over
           time to par value. Some bonds may be called earlier at par
           for extraordinary reasons.
        o  % of the bonds are insured by AAA-rated insurance companies
           that guarantee timely payments of principal and interest on
           the bonds (but not Fund units or the market value of the
           bonds before they mature).
 
           The Portfolio consists of municipal bonds of the following
           types:

 

                                                 APPROXIMATE
                                                  PORTFOLIO
                                                  PERCENTAGE

 

o          Airports/Ports/Highways                         %
        o  Hospitals/Health Care                             %
        o  Housing                                             %
o          Industrial Development                           %
        o  Lease Rental Appropriation                      %
        o  Special Tax                                          %
        o  Miscellaneous                                       %

 

       4.  WHAT ARE THE SIGNIFICANT RISKS?
           YOU CAN LOSE MONEY BY INVESTING IN THE FUND. THIS CAN
           HAPPEN FOR VARIOUS REASONS, INCLUDING:
        o  Rising interest rates, an issuer's worsening financial
           condition or a drop in bond ratings can reduce the price of
           your units.
        o  Because the Fund is concentrated in bonds, adverse
           developments in this industry may affect the value of your
           units.
        o  Assuming no changes in interest rates, when you sell your
           units, they will generally be worth less than your cost
           because your cost included a sales fee.
        o  The Fund will receive early returns of principal if bonds
           are called or sold before they mature. If this happens your
           income will decline and you may not be able to reinvest the
           money you receive at as high a yield or as long a maturity.

 

       5.  IS THIS FUND APPROPRIATE FOR YOU?
           Yes, if you want federally tax-free income. You will
           benefit from a professionally selected and supervised
           portfolio whose risk is reduced by investing in bonds of
           several different issuers.
           The Fund is not appropriate for you if you want a
           speculative investment that changes to take advantage of
           market movements, if you do not want a tax-advantaged
           investment or if you cannot tolerate any risk.

 
                                       4
<PAGE>
 
           DEFINING YOUR INCOME
 

           WHAT YOU MAY EXPECT
           Regular Semi-Annual Income per 1,000 units
           (each March and September beginning 9/25/99):     $
           Annual Income per 1,000 units:                    $
           RECORD DAY: 10th day of each March and September
           These figures are estimates on the business day before the
           initial date of deposit; actual payments may vary.

 

       6.  WHAT ARE THE FUND'S FEES AND EXPENSES?
           This table shows the costs and expenses you may pay,
           directly or indirectly, when you invest in the Fund.

 

           INVESTOR FEES
                                                               2.90%
           Maximum Sales Fee (Load) on new purchases
           (as a percentage of $1,000 invested)

 

           You will pay an up-front sales fee of 1.00%, as well as a
           total deferred sales fee of $19.00 ($2.38 per 1,000 units
           quarterly in the first year and $2.37 per 1,000 units
           quarterly in the second year).
           The maximum sales fee is reduced if you invest at least
           $100,000, as follows:

 

                                                 YOUR MAXIMUM
                                                    SALES FEE
                     IF YOU INVEST:                  WILL BE:
           -----------------------------------  -----------------
           $100,000 to $249,999                          2.65%
           $250,000 to $499,999                          2.40%
           $500,000 to $999,999                          2.15%
           $1,000,000 and over                           1.90%
 
           Maximum Exchange Fee                          1.90%

 
           ESTIMATED ANNUAL FUND OPERATING EXPENSES
 

                                           AS A % OF       AMOUNT
                                              $1,000    PER 1,000
                                            INVESTED        UNITS
                                           ----------  -----------
                                                    %   $
           Trustee's Fee
                                                    %   $
           Portfolio Supervision,
           Bookkeeping and
           Administrative Fees
                                                    %   $
           Evaluator's Fee
                                                    %   $
           Other Operating Expenses
                                           ----------  -----------
                                                    %   $
           TOTAL

 

                                                          AMOUNT
                                                       PER 1,000
                                                           UNITS
                                                 ---------------------
           ORGANIZATIONAL COSTS (deducted from
           Fund assets at the close of the
           initial offering period)

 

           EXAMPLE
           This example may help you compare the cost of investing in
           the Fund to the cost of investing in other funds.
           The example assumes that you invest $10,000 in the Fund for
           the periods indicated and sell all your units at the end of
           those periods. The example also assumes a 5% return on your
           investment each year and that the Fund's operating expenses
           stay the same. Although your actual costs may be higher or
           lower, based on these assumptions your costs would be:

 

            1 Year     3 Years    5 Years    10 Years
               $          $          $          $

 

           You will pay the following expenses if you do not sell
           your units:

 

            1 Year     3 Years    5 Years    10 Years
               $          $          $          $

 

       7.  HOW HAVE SIMILAR FUNDS PERFORMED IN THE PAST?
           This Fund is new and has no performance history, but in
           the following chart we show past performance of the
           municipal Monthly Payment Series, which had investment
           objectives, strategies and types of bonds substantially
           similar to this Fund. These prior Series differed in that
           they charged a higher sales fee and made monthly income
           distributions. These prior Monthly Payment Series were
           offered between January 1, 1988 and June 30, 1997 and were
           outstanding on June 30, 1998. OF COURSE, PAST PERFORMANCE
           OF PRIOR SERIES IS NO GUARANTEE OF FUTURE RESULTS OF THIS
           FUND.
           AVERAGE ANNUAL COMPOUND TOTAL RETURNS
           Reflecting all expenses. For periods ended 6/30/98.

 

                  4.5%SALES FEE              NO SALES FEE
               1 YEAR       5 YEARS      1 YEAR       5 YEARS
- ---------------------------------------------------------------
High            6.71%        5.50%       12.69%        6.68%
Average         4.35         4.60         7.78         5.62
Low             2.07         3.71         3.74         4.70
- ---------------------------------------------------------------

 
Note: All returns represent changes in unit price with distributions reinvested
 into the Municipal Fund Investment Accumulation Program.
 

       8.  IS THE FUND MANAGED?
           Unlike a mutual fund, the Fund is not managed and bonds
           are not sold because of market changes. Rather,
           experienced

 
                                       5
<PAGE>
 

           Defined Asset Funds financial analysts regularly review the
           bonds in the Fund. The Fund may sell a bond if certain
           adverse credit or other conditions exist.
       9.  HOW DO I BUY UNITS?
           You can buy units from any of the Sponsors and other
           broker-dealers. The Sponsors are listed later in this
           prospectus.
           The minimum investment is $250.
           UNIT PRICE                                $
           (as of             , 1998)
           Unit price is based on the net asset value of the Fund plus
           the up-front sales fee. An amount equal to any principal
           cash, as well as net accrued but undistributed interest on
           the unit, is added to the unit price. Unit price also
           includes the estimated organization costs shown on the
           previous page. An independent evaluator prices the bonds at
           3:30 p.m. Eastern time every business day. Unit price
           changes every day with changes in the prices of the bonds
           in the Fund.
           UNIT PAR VALUE                               $1.00
           Unit par value means the total amount of money you should
           generally receive on each unit by the termination of the
           Fund (other than interest and premium on the bonds). This
           total amount assumes that all bonds in the Fund are either
           paid at maturity or called by the issuer at par or are sold
           by the Fund at par. If you sell your units before the Fund
           terminates, you may receive more or less than the unit par
           value.
      10.  HOW DO I SELL UNITS?
           You may sell your units at any time to any Sponsor or the
           Trustee for the net asset value determined at the close of
 
           business on the date of sale, less any remaining deferred
           sales fee. There is no fee for selling units.
      11.  HOW ARE DISTRIBUTIONS MADE AND TAXED?
           The Fund pays income twice a year.

 

           In the opinion of bond counsel when each bond was issued,
           interest on the bonds in this Fund is generally 100% exempt
           from regular federal income tax. A portion of the income
           may also be exempt from state and local personal income
           taxes, depending on where you live.
           You will also receive principal payments if bonds are sold
           or called or mature, when the cash available is more than
           $10.00 per 1,000 units. You will be subject to tax on any
           gain realized by the Fund on the disposition of bonds.
      12.  WHAT OTHER SERVICES ARE AVAILABLE?
           REINVESTMENT
           You will receive your semi-annual income in cash unless you
           choose to compound your income by reinvesting at no sales
           fee in the Municipal Fund Investment Accumulation Program,
           Inc. This Program is an open-end mutual fund with a
           comparable investment objective. Income from this Program
           will generally be subject to state and local income taxes.
           For more complete information about the Program, including
           charges and fees, ask the Trustee for the Program's
           prospectus. Read it carefully before you invest. The
           Trustee must receive your written election to reinvest at
           least 10 days before the record day of an income payment.
           EXCHANGE PRIVILEGES
           You may exchange units of this Fund for units of certain
           other Defined Asset Funds. You may also exchange into this
           Fund from certain other funds. We charge a reduced sales
           fee on exchanges.

 
- --------------------------------------------------------------------------------
    TAX-FREE VS. TAXABLE INCOME: A COMPARISON OF TAXABLE AND TAX-FREE YIELDS
 
<TABLE><CAPTION>

                                  EFFECTIVE
TAXABLE INCOME 1998*               % TAX                         TAX-FREE YIELD OF
  SINGLE RETURN    JOINT RETURN   BRACKET    3%     3.5%     4%     4.5%     5%     5.5%     6%     6.5%
                                                        IS EQUIVALENT TO A TAXABLE YIELD OF
- ----------------------------------------------------------------------------------------------------------
<S>              <C>                <C>       <C>    <C>      <C>    <C>     <C>    <C>      <C>    <C>
$      0- 25,350 $      0- 42,350   15.00     3.53   4.12     4.71   5.29     5.88    6.47    7.06    7.65
- ----------------------------------------------------------------------------------------------------------
$ 25,351- 61,400 $ 42,351-102,300   28.00     4.17   4.86     5.56   6.25     6.94    7.64    8.33    9.03
- ----------------------------------------------------------------------------------------------------------
$ 61,401-128,100 $102,301-155,950   31.00     4.35   5.07     5.80   6.52     7.25    7.97    8.70    9.42
- ----------------------------------------------------------------------------------------------------------
$128,101-278,450 $155,951-278,450   36.00     4.69   5.47     6.25   7.03     7.81    8.59    9.38   10.16
- ----------------------------------------------------------------------------------------------------------
OVER $278,450       OVER $278,450   39.60     4.97   5.79     6.62   7.45     8.28    9.11    9.93   10.76
- --------------------------------------------------------------------------------------------------
</TABLE>

 
To compare the yield of a taxable security with the yield of a tax-free
security, find your taxable income and read across. The table incorporates 1998
federal income tax rates and assumes that all income would otherwise be taxed at
the investor's highest tax rate. Yield figures are for example only.
 
*Based upon net amount subject to federal income tax after deductions and
exemptions. This table does not reflect the possible effect of other tax
factors, such as alternative minimum tax, personal exemptions, the phase out of
exemptions, itemized deductions, the possible partial disallowance of deductions
or state or local taxation. Consequently, you should consult your own tax
advisers in this regard.
 
                                       6
<PAGE>
WHAT YOU CAN EXPECT FROM YOUR INVESTMENT
 
INCOME TWICE A YEAR
 
The Fund will pay you regular income twice a year. Your income may vary because
of:
   o elimination of one or more bonds from the Fund's portfolio because of
     calls, redemptions or sales;
   o a change in the Fund's expenses; or
   o the failure by a bond's issuer to pay interest.
 
Changes in interest rates generally will not affect your income because the
portfolio is fixed.
 
Along with your income, you will receive your share of any available bond
principal.
 
RETURN FIGURES
 
We cannot predict your actual return, which will vary with unit price, how long
you hold your investment and changes in the portfolio, interest income and
expenses.
 
Estimated Current Return equals the estimated annual cash to be received from
the bonds in the Fund less estimated annual Fund expenses, divided by the Unit
Price (including the maximum sales fee):
 

 Estimated Annual                  Estimated
 Interest Income        -       Annual Expenses
- -------------------------------------------------
                   Unit Price

 
Estimated Long Term Return is a measure of the estimated return over the
estimated life of the Fund. Unlike Estimated Current Return, Estimated Long Term
Return reflects maturities, discounts and premiums of the bonds in the Fund. It
is an average of the yields to maturity (or in certain cases, to an earlier call
date) of the individual bonds in the portfolio, adjusted to reflect the Fund's
maximum sales fee and estimated expenses. We calculate the average yield for the
portfolio by weighting each bond's yield by its market value and the time
remaining to the call or maturity date.
 
Yields on individual bonds depend on many factors including general conditions
of the bond markets, the size of a particular offering and the maturity and
quality rating of the particular issues. Yields can vary among bonds with
similar maturities, coupons and ratings.
 
These return quotations are designed to be comparative rather than predictive.
 
RECORDS AND REPORTS
 
You will receive:
o a statement of income and any principal payments twice a year;
o a notice from the Trustee when new bonds are deposited in exchange or
  substitution for bonds originally deposited;
o an annual report on Fund activity; and
o annual tax information. This will also be sent to the IRS. You must report the
  amount of tax-exempt interest received during the year.
 
You may request:
o copies of bond evaluations to enable you to comply with federal and state tax
  reporting requirements; and
o audited financial statements of the Fund.
 
You may inspect records of Fund transactions at the Trustee's office during
regular business hours.
 
                                       7
<PAGE>
THE RISKS YOU FACE
 
INTEREST RATE RISK
 
Investing involves risks, including the risk that your investment will decline
in value if interest rates rise. Generally, bonds with longer maturities will
change in value more than bonds with shorter maturities. Bonds in the Fund are
more likely to be called when interest rates decline. This would result in early
returns of principal to you and may result in early termination of the Fund. Of
course, we cannot predict how interest rates may change.
 
CALL RISK
 
Many bonds can be prepaid or 'called' by the issuer before their stated
maturity.
 
For example, an issuer might call its bonds if it no longer needs the money for
the original purpose or, during periods of falling interest rates, if the
issuer's bonds have a coupon higher than current market rates. If the bonds are
called, your income will decline and you may not be able to reinvest the money
you receive at as high a yield or as long a maturity. An early call at par of a
premium bond will reduce your return.
 
REDUCED DIVERSIFICATION RISK
 
If many investors sell their units, the Fund will have to sell bonds. This could
reduce the diversification of your investment and increase your share of Fund
expenses.
 
LIQUIDITY RISK
 
The bonds will generally trade in the over-the-counter market. We cannot assure
you that a liquid trading market will exist, especially since current law may
restrict the Fund from selling bonds to any Sponsor. The value of the bonds, and
of your investment, may be reduced if trading in bonds is limited or absent.
 
CONCENTRATION RISK
 
When a certain type of bond makes up 25% or more of the portfolio, the Fund is
said to be 'concentrated' in that bond type, which makes the Fund less
diversified.
 
Here is what you should know about the Fund's concentration in [hospital and
health care bonds.
   o payment for these bonds depends on revenues from private third-party payors
      and government programs, including Medicare and Medicaid, which have
      generally undertaken cost containment measures to limit payments to health
     care providers;
   o hospitals face competition resulting from hospital mergers and
     affiliations;
   o hospitals need to reduce costs as HMOs increase market penetration and
     hospital supply and drug companies raise prices; and
   o hospitals and health care providers are subject to various legal claims by
     patients and others and are adversely affected by increasing costs of
     insurance.]
 
Changes to the portfolio from bond redemptions, maturities and sales may affect
the Fund's concentration over time.
 
BOND QUALITY RISK
 
A reduction in a bond's rating may decrease its value and, indirectly, the value
of your investment in the Fund.
 
INSURANCE RELATED RISK
 
Some bonds are backed by insurance companies (as shown under Municipal Defined
Fund Portfolio). Insurance policies generally make payments of principal only
according to a bond's original principal payment schedule and do not make early
 
                                       8
<PAGE>
payments when a bond defaults or becomes taxable. Although the federal
government does not regulate the insurance business, various state laws and
federal initiatives and tax law changes could significantly affect the insurance
business. The claims-paying ability of the insurance companies is generally
rated AAA by Standard & Poor's or another nationally recognized rating
organization. The insurance company ratings are subject to change at any time at
the discretion of the rating agencies.
 
LITIGATION AND LEGISLATION RISKS
 
We do not know of any pending litigation that might have a material adverse
effect upon the Fund.
 
Future tax legislation could affect the value of the portfolio by:
   o limiting real property taxes,
   o reducing tax rates,
   o imposing a flat or other form of tax, or
   o exempting investment income from tax.
 
SELLING OR EXCHANGING UNITS
 
You can sell your units at any time for a price based on net asset value. Your
net asset value is calculated each business day by:
   o adding the value of the bonds, net accrued interest, cash and any other
     Fund assets;
   o subtracting accrued but unpaid Fund expenses, unreimbursed Trustee
      advances, cash held to buy back units or for distribution to investors and
     any other Fund liabilities; and
   o dividing the result by the number of outstanding units.
 
Your net asset value when you sell may be more or less than your cost because of
sales fees, market movements and changes in the portfolio.
 
As of the close of the initial offering period, the price you receive will be
reduced to reflect estimated organization costs.
 
If you sell your units before the final deferred sales fee installment, the
amount of any remaining installments will be deducted from your proceeds.
 
SPONSORS' SECONDARY MARKET
 
While we are not obligated to do so, we will buy back units at net asset value
without any other fee or charge other than any remaining deferred sales charge.
We may resell the units to other buyers or to the Trustee. You should consult
your financial professional for current market prices to determine if other
broker-dealers or banks are offering higher prices.
 
We may discontinue the secondary market without prior notice for any business
reason.
 
SELLING UNITS TO THE TRUSTEE
 
Regardless of whether we maintain a secondary market, you can sell your units to
the Trustee at any time by sending the Trustee a letter (with any outstanding
certificates if you hold Unit certificates). You must properly endorse your
certificates (or execute a written transfer instrument with signatures
guaranteed by an eligible institution). Sometimes, additional documents are
needed such as a trust document, certificate of corporate authority, certificate
of death or appointment as executor, administrator or guardian.
 
Within seven days after your request and the necessary documents are received,
the Trustee will mail a check to you. Contact the Trustee for additional
information.
 
                                       9
<PAGE>
As long as we are maintaining a secondary market, the Trustee will sell your
units to us at a price based on net asset value. If there is no secondary
market, the Trustee will sell your units in the over-the-counter market if it
believes it can obtain a higher price. In that case, you will receive the net
proceeds of the sale.
 
If the Fund does not have cash available to pay you for units you are selling,
the agent for the Sponsors will select bonds to be sold. Bonds will be selected
based on market and credit factors. These sales could be made at times when the
bonds would not otherwise be sold and may result in your receiving less than the
unit par value and also reduce the size and diversity of the Fund.
 
If you acquire 25% or more of the outstanding units of the Fund and you sell
units with a value exceeding $250,000, the Trustee may pay you 'in kind' by
distributing bonds and cash with a total value equal to the price of those
units. The Trustee will try to distribute bonds in the portfolio pro rata, but
it reserves the right to distribute only one or a few bonds. The Trustee will
act as your agent in an in kind distribution and will either hold the bonds for
your account or sell them as you instruct. You must pay any transaction costs as
well as transfer and ongoing custodial fees on sales of bonds distributed in
kind.
 
There could be a delay in paying you for your units:
   o if the New York Stock Exchange is closed (other than customary weekend and
      holiday closings);
   o if the SEC determines that trading on the New York Stock Exchange is
     restricted or that an emergency exists making sale or evaluation of the
     bonds not reasonably practicable; and
   o for any other period permitted by SEC order.
 
EXCHANGE OPTION
 
The Defined Asset Funds family offers you the ability to exchange from one fund
into another if your investment goals change. You may be entitled to a reduced
sales charge in certain circumstances. To exchange units, you should talk to
your financial professional about what is suitable, currently available and the
current price.
 
Normally, an exchange is taxable and you must recognize any gain or loss on the
exchange. However, the IRS may try to disallow a loss if the portfolios of the
two funds are not materially different; you should consult your own tax adviser.
 
We may amend or terminate this exchange option at any time without notice.
 
                                       10
<PAGE>
HOW THE FUND WORKS
 
PRICING
 
The price of a unit includes interest accrued on the bonds, less expenses, from
the initial date of deposit up to, but not including, the settlement date, which
is usually three business days after the purchase date of the unit.
 
Bonds also carry accrued but unpaid interest up to the initial date of deposit.
To avoid having you pay this additional accrued interest (which earns no return)
when you buy, the Trustee advances this amount to the Sponsors. The Trustee
recovers this advance from interest received on the bonds.
 
In addition, a portion of the price of a unit also consists of cash to pay all
or some of the costs of organizing the Fund including:
   o cost of initial preparation of legal documents;
   o federal and state registration fees;
   o initial fees and expenses of the Trustee;
   o initial audit; and
   o legal expenses and other out-of-pocket expenses.
 
EVALUATIONS
 
An independent Evaluator values the bonds on each business day (excluding
Saturdays, Sundays and the following holidays as observed by the New York Stock
Exchange: New Year's Day, Presidents' Day, Martin Luther King, Jr. Day, Good
Friday, Memorial Day, Independence Day, Labor Day, Thanksgiving and Christmas).
Bond values are based on current bid or offer prices for the bonds or comparable
bonds. In the past, the difference between bid and offer prices of publicly
offered tax-exempt bonds has ranged from 0.5% of face amount on actively traded
issues to 3.5% on inactively traded issues; the difference has averaged between
1 and 2%.
 
INCOME
 
Interest on any bonds purchased on a when-issued basis or for a delayed delivery
does not begin to accrue interest until the bonds are delivered to the Fund. The
Trustee may reduce its fee to provide you with tax-exempt income for this
non-accrual period. If a bond is not delivered on time and the Trustee's annual
fee and expenses do not cover the additional accrued interest, we will treat the
contract to buy the bond as failed.
 
The Trustee credits interest to an Income Account and other receipts to a
Capital Account. The Trustee may establish a Reserve Account by withdrawing from
these accounts amounts it considers appropriate to pay any material liability.
These accounts do not bear interest.
 
EXPENSES
 
The Trustee is paid a fee monthly. It also benefits when it holds cash for the
Fund in non-interest bearing accounts. The Trustee may also receive additional
amounts:
   o for extraordinary services and costs of indemnifying the Trustee and the
      Sponsors;
   o costs of actions taken to protect the Fund and other legal fees and
     expenses;
   o expenses for keeping the Fund's registration statement current; and
   o Fund termination expenses and any governmental charges.
 
The Sponsors are currently reimbursed up to cents per $1,000 face amount
annually for
 
                                       11
<PAGE>
providing portfolio supervisory, bookkeeping and administrative services and for
any other expenses properly chargeable to the Fund. While this fee may exceed
the amount of these costs and expenses attributable to this Fund, the total of
these fees for all Series of Defined Asset Funds will not exceed the aggregate
amount attributable to all of these Series for any calendar year. The Fund also
pays the Evaluator's fees.
 
The Trustee's, Sponsors' and Evaluator's fees may be adjusted for inflation
without investors' approval.
 
Quarterly deferred sales charges you owe are paid with interest and principal
from certain bonds. If these amounts are not enough, the rest will be paid out
of distributitons to you from the Fund's Capital and Income Accounts.
 
The Sponsors will pay advertising and selling expenses at no charge to the Fund.
If Fund expenses exceed initial estimates, the Fund will owe the excess. The
Trustee has a lien on Fund assets to secure reimbursement of Fund expenses and
may sell bonds if cash is not available.
 
PORTFOLIO CHANGES
 
The Sponsors and Trustee are not liable for any default or defect in a bond; if
a contract to buy any bond fails in the first 90 days of the Fund, we generally
will deposit a replacement tax-exempt bond with a similar yield, maturity,
rating and price.
 
Unlike a mutual fund, the portfolio is designed to remain intact and we may keep
bonds in the portfolio even if their credit quality declines or other adverse
financial circumstances occur. However, we may sell a bond in certain cases if
we believe that certain adverse credit conditions exist or if a bond becomes
taxable.
 
If we maintain a secondary market in units but are unable to sell the units that
we buy in the secondary market, we will redeem units, which will affect the size
and composition of the portfolio. Units offered in the secondary market may not
represent the same face amount of bonds that they did originally.
 
We decide whether or not to offer units for sale that we acquire in the
secondary market after reviewing:
   o diversity of the portfolio;
   o size of the Fund relative to its original size;
   o ratio of Fund expenses to income;
   o current and long-term returns;
   o degree to which units may be selling at a premium over par; and
   o cost of maintaining a current prospectus.
 
FUND TERMINATION
 
The Fund will terminate following the stated maturity or sale of the last bond
in the portfolio. The Fund may also terminate earlier with the consent of
investors holding 51% of the units or if total assets of the Fund have fallen
below 40% of the face amount of bonds originally deposited. We will decide
whether to terminate the Fund early based on the same factors used in deciding
whether or not to offer units in the secondary market.
 
At the maturity of the Fund, you will receive notice that the Fund is about to
terminate, and you will be unable to sell your units after that time. On or
shortly before termination, we will sell any remaining bonds, and you will
receive your final distribution. Any bond that cannot
 
                                       12
<PAGE>
be sold at a reasonable price may continue to be held by the Trustee in a
liquidating trust pending its final sale.
 
You will pay your share of the expenses associated with termination, including
brokerage costs in selling bonds. This may reduce the amount you receive as your
final distribution.
 
CERTIFICATES
 
Certificates for units are issued on request. You may transfer certificates by
complying with the requirements for redeeming certificates, described above. You
can replace lost or mutilated certificates by delivering satisfactory indemnity
and paying the associated costs.
 
TRUST INDENTURE
 
The Fund is a 'unit investment trust' governed by a Trust Indenture, a contract
among the Sponsors, the Trustee and the Evaluator, which sets forth their duties
and obligations and your rights. A copy of the Indenture is available to you on
request to the Trustee. The following summarizes certain provisions of the
Indenture.
 
The Sponsors and the Trustee may amend the Indenture without your consent:
   o to cure ambiguities;
   o to correct or supplement any defective or inconsistent provision;
   o to make any amendment required by any governmental agency; or
   o to make other changes determined not to be materially adverse to your best
     interest (as determined by the Sponsors).
Investors holding 51% of the units may amend the Indenture. Every investor must
consent to any amendment that changes the 51% requirement. No amendment may
reduce your interest in the Fund without your written consent.
 
The Trustee may resign by notifying the Sponsors. The Sponsors may remove the
Trustee without your consent if:
   o it fails to perform its duties;
   o it becomes incapable of acting or bankrupt or its affairs are taken over by
      public authorities; or
   o the Sponsors determine that its replacement is in your best interest.
Investors holding 51% of the units may remove the Trustee. The Evaluator may
resign or be removed by the Sponsors and the Trustee without the consent of
investors. The resignation or removal of either becomes effective when a
successor accepts appointment. The Sponsors will try to appoint a successor
promptly; however, if no successor has accepted within 30 days after notice of
resignation, the resigning Trustee or Evaluator may petition a court to appoint
a successor.
 
Any Sponsor may resign as long as one Sponsor with a net worth of $2 million
remains and agrees to the resignation. The remaining Sponsors and the Trustee
may appoint a replacement. If there is only one Sponsor and it fails to perform
its duties or becomes bankrupt the Trustee may:
   o remove it and appoint a replacement Sponsor;
   o liquidate the Fund; or
   o continue to act as Trustee without a Sponsor.
 
Merrill Lynch, Pierce, Fenner & Smith Incorporated acts as agent for the
Sponsors.
 
                                       13
<PAGE>
The Trust Indenture contains customary provisions limiting the liability of the
Trustee, the Sponsors and the Evaluator.
 
LEGAL OPINION
 
Davis Polk & Wardwell, 450 Lexington Avenue, New York, New York 10017, as
special counsel for the Sponsors, has given an opinion that the units are
validly issued.
AUDITORS
 
Deloitte & Touche LLP, 2 World Financial Center, New York, New York 10281,
independent accountants, audited the Statement of Condition included in this
prospectus.
 
SPONSORS
 
The Sponsors and their underwriting percentages are:
 
MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED (a wholly-owned subsidiary of
Merrill Lynch & Co., Inc.)
P.O. Box 9051,
Princeton, NJ 08543-9051                                                       %
 
SMITH BARNEY INC. (an indirectly wholly-owned subsidiary of The Travelers Inc.)
388 Greenwich Street--23rd Floor,
New York, NY 10013                                                             %
 
DEAN WITTER REYNOLDS INC. (a principal operating subsidiary of Morgan Stanley
Dean Witter & Co.)
Two World Trade Center--59th Floor,
New York, NY 10048                                                             %
PAINEWEBBER INCORPORATED (a wholly-owned subsidiary of PaineWebber Group Inc.)
1285 Avenue of the Americas,
New York, NY 10019                                                      _______%
 
                                                100.00%
 
Each Sponsor is a Delaware corporation and it, or its predecessor, has acted as
sponsor to many unit investment trusts. As a registered broker-dealer each
Sponsor buys and sells securities (including investment company shares) for
others (including investment companies) and participates as an underwriter in
various selling groups.
 
TRUSTEE
 
The Bank of New York, 101 Barclay Street, 17 W, New York, New York 10268, is the
Trustee. It is supervised by the Federal Deposit Insurance Corporation, the
Board of Governors of the Federal Reserve System and New York State banking
authorities.
 
UNDERWRITERS' AND SPONSORS' PROFITS
 
Underwriters receive sales charges when they sell units. Sponsors also realize a
profit or loss on deposit of the bonds shown under Municipal Defined Fund
Portfolio. Any cash made available by you to the Sponsors before the settlement
date for those units may be used in the Sponsors' businesses to the extent
permitted by federal law and may benefit the Sponsors.
 
A Sponsor or Underwriter may realize profits or sustain losses on bonds in the
Fund which
 
                                       14
<PAGE>
were acquired from underwriting syndicates of which it was a member. We bought
approximately    % of the bonds in the portfolio from one or more of the
Sponsors (as sole underwriter, managing underwriter or member of an underwriting
syndicate).
 
During the initial offering period, the Sponsors also may realize profits or
sustain losses on units they hold. In maintaining a secondary market, the
Sponsors will also realize profits or sustain losses in the amount of any
difference between the prices at which they buy units and the prices at which
they resell or redeem them.
 
PUBLIC DISTRIBUTION
 
During the initial offering period, units will be distributed to the public by
the Sponsors and dealers who are members of the National Association of
Securities Dealers, Inc. This period is 30 days or less if all units are sold.
The Sponsors may extend the initial period up to 120 days.
 
The Sponsors do not intend to qualify units for sale in any foreign countries.
This prospectus does not constitute an offer to sell units in any country where
units cannot lawfully be sold.
 
In the initial offering period, the concession to dealers will be $21 per 1,000
units. We may change the concession at any time. Dealers may resell units to
other dealers with a concession not in excess of the original concession to
dealers.
 
CODE OF ETHICS
 
Merrill Lynch, as agent for the Sponsors, has adopted a code of ethics requiring
preclearance and reporting of personal securities transactions by its employees
with access to information on portfolio transactions. The goal of the code is to
prevent fraud, deception or misconduct against the Fund and to provide
reasonable standards of conduct.
 
TAXES
 
The following summary describes some of the important income tax consequences of
holding units. It assumes that you are not a dealer, financial institution,
insurance company or other investor with special circumstances. You should
consult your own tax adviser about your particular circumstances.
 
At the date of issue of each bond, counsel for the issuer delivered an opinion
to the effect that interest on the bond is exempt from regular federal income
tax. However, interest may be subject to state and local taxes and federal
alternative minimum tax. Neither we nor our counsel have reviewed the issuance
of the bonds, related proceedings or the basis for the opinions of counsel for
the issuers. We cannot assure you that the issuer (or other users) have complied
or will comply with any requirements necessary for a bond to be tax-exempt. If
any of the bonds were determined not to be tax-exempt, you could be required to
pay income tax for current and prior years, and if the Fund were to sell the
bond, it might have to sell it at a substantial discount.
 
In the opinion of our counsel, under existing law:
 
GENERAL TREATMENT OF THE FUND AND YOUR INVESTMENT
 
The Fund will not be taxed as a corporation for federal income tax purposes, and
you will
 
                                       15
<PAGE>
be considered to own directly your share of each bond in the Fund.
 
INCOME OR LOSS UPON DISPOSITION
 
When all or part of your share of a bond is disposed of (for example, when the
Fund sells, exchanges or redeems a bond or when you sell or exchange your
units), you will generally recognize capital gain or loss. Your gain, however,
will generally be ordinary income to the extent of any accrued 'market
discount'. Generally you will have market discount to the extent that your basis
in a bond when you purchase a unit is less than its stated redemption price at
maturity (or, if it is an original issue discount bond, the issue price
increased by original issue discount that has accrued on the bond before your
purchase). You should consult your tax adviser in this regard.
 
If your net long-term capital gains exceed your net short-term capital losses,
the excess may be subject to tax at a lower rate than ordinary income. Any
capital gain from the Fund will be long-term if you are considered to have held
your investment on each bond for more than one year and short-term if you held
it for one year or less. If you are an individual and sell your units after
holding them for more than 12 months, you may be entitled to a 20% maximum
federal tax rate on any resulting gains. Consult your tax adviser in this
regard. Because the deductibility of capital losses is subject to limitations,
you may not be able to deduct all of your capital losses.
 
YOUR BASIS IN THE BONDS
 
Your aggregate basis in the bonds will be equal to the cost of your units,
including any sales charges and the organizational expenses you pay, adjusted to
reflect any accruals of 'original issue discount,' 'acquisition premium' and
'bond premium'. You should consult your tax adviser in this regard.
 
EXPENSES
 
If you are not a corporate investor, you will not be entitled to a deduction for
your share of fees and expenses of the Fund. Also, if you borrowed money in
order to purchase or carry your units, you will not be able to deduct the
interest on this borrowing for federal income tax purposes. The IRS may treat
your purchase of units as made with borrowed money even if the money is not
directly traceable to the purchase of units.
 
STATE AND LOCAL TAXES
 
Under the income tax laws of the State and City of New York, the Fund will not
be taxed as a corporation. If you are a New York taxpayer, your income from the
Fund will not be tax-exempt in New York except to the extent that the income is
earned on bonds that are tax-exempt for New York purposes. Depending on where
you live, your income from the Fund may be subject to state and local taxation.
You should consult your tax adviser in this regard.
 
                                       16
<PAGE>
SUPPLEMENTAL INFORMATION
 
You can receive at no cost supplemental information about the Fund by calling
the Trustee. The supplemental information includes more detailed risk disclosure
about the types of bonds that may be in the Fund's portfolio, general risk
disclosure concerning any insurance securing certain bonds, and general
information about the structure and operation of the Fund. The supplemental
information is also available from the SEC.
 
                                       17
<PAGE>
                       REPORT OF INDEPENDENT ACCOUNTANTS
 
The Sponsors, Trustee and Holders of Defined Asset Funds Municipal Defined Fund
(the 'Fund'):
 
We have audited the accompanying statement of condition and the related defined
portfolio included in the prospectus of the Fund as of            , 1998. This
financial statement is the responsibility of the Trustee. Our responsibility is
to express an opinion on this financial statement based on our audit.
 
We conducted our audit in accordance with generally accepted auditing standards.
Those standards require that we plan and perform the audit to obtain reasonable
assurance about whether the financial statement is free of material
misstatement. An audit includes examining, on a test basis, evidence supporting
the amounts and disclosures in the financial statement. Our procedures included
confirmation of cash, securities and an irrevocable letter of credit deposited
for the purchase of securities, as described in the statement of condition, with
the Trustee. An audit also includes assessing the accounting principles used and
significant estimates made by the Trustee, as well as evaluating the overall
financial statement presentation. We believe that our audit provides a
reasonable basis for our opinion.
 
In our opinion, the financial statement referred to above presents fairly, in
all material respects, the financial position of the Fund as of            ,
1998 in conformity with generally accepted accounting principles.
 
DELOITTE & TOUCHE LLP
NEW YORK, N.Y.
, 1998
              STATEMENT OF CONDITION AS OF                  , 1998
 
TRUST PROPERTY
 

Investments--Bonds and Contracts to purchase Bonds(1)    $
Cash
Accrued interest to Initial Date of Deposit on underlying
  Bonds
                                                         --------------------
           Total                                         $
                                                         --------------------
                                                         --------------------
LIABILITIES AND INTEREST OF HOLDERS
Liabilities: Advance by Trustee for accrued interest (2) $
Reimbursement of Sponsors for Organization Expenses (3)  $
                                                         --------------------
Subtotal
                                                         --------------------
Interest of Holders of         Units of fractional
  undivided interest outstanding:
Cost to investors (4)(5)
Organization Expenses (3)
                                                         --------------------
Subtotal
                                                         --------------------
           Total                                         $
                                                         --------------------
                                                         --------------------

 
- ---------------
 
          (1) Aggregate cost to the Fund of the bonds listed under Defined
Portfolio is based upon the offer side evaluation determined by the Evaluator at
the evaluation time on the business day prior to the Initial Date of Deposit.
The contracts to purchase the bonds are collateralized by an irrevocable letter
of credit which has been issued by The        Bank, New York Branch, in the
amount of $              and deposited with the Trustee. The amount of the
letter of credit includes $              for the purchase of $           face
amount of the bonds, plus $           for accrued interest.
          (2) Representing a special distribution to the Sponsors by the Trustee
of an amount equal to the accrued interest on the bonds.
          (3) A portion of the Unit Price consists of cash in an amount
sufficient to pay for costs incurred in establishing the Fund. These costs have
been estimated at $    per 1,000 Units. A distribution will be made at the close
of the initial offering period to an account maintained by the Trustee from
which the organizational expense obligation of the investors to the Sponsors
will be satisfied.
          (4) A mandatory distribution of $2.38 per 1,000 Units in the first
year and $2.37 per 1,000 units in the second year is payable quarterly up to an
aggregate of over approximately a two-year period. Distributions will be made to
an account maintained by the Trustee from which the deferred sales charge
obligation of the investors to the Sponsors will be satisfied. If units are
redeemed prior to the end of the second anniversary of the Fund, the remaining
portion of the deferred sales charge distribution will be transferred to the
account on the redemption date.
          (5) Aggregate Unit Price (exclusive of interest) computed on the basis
of the offer side evaluation of the underlying bonds as of the evaluation time
on the business day prior to the Initial Date of Deposit.
 
                                       18


<PAGE>
                                                  DEFINED
                             ASSET FUNDSSM
 

HAVE QUESTIONS ?                         MUNICIPAL DEFINED FUND
Request a free                           (A Unit Investment Trust)
Information Supplement                   ---------------------------------------
dated 5/13/98 that gives                 This Prospectus does not contain
more details about the                   complete information about the
Fund, by calling:                        investment company filed with the
The Bank of New York                     Securities and Exchange Commission in
1-800-221-7771                           Washington, D.C. under the:
                                         o Securities Act of 1933 (file no.
                                         333-58397) and
                                         o Investment Company Act of 1940 (file
                                         no. 811-1777).
                                         TO OBTAIN COPIES AT PRESCRIBED RATES--
                                         WRITE: Public Reference Section of the
                                         Commission
                                         450 Fifth Street, N.W., Washington,
                                         D.C. 20549-6009
                                         CALL: 1-800-SEC-0330.
                                         VISIT: http://www.sec.gov.
                                         ---------------------------------------
                                         No person is authorized to give any
                                         information or representations about
                                         this Fund not contained in this
                                         Prospectus or the Information
                                         Supplement, and you should not rely on
                                         any other information.
                                         ---------------------------------------
                                         When units of this Fund are no longer
                                         available, this Prospectus may be used
                                         as a preliminary prospectus for a
                                         future series, but some of the
                                         information in this Prospectus will be
                                         changed for that series.
                                         Units of any future series may not be
                                         sold nor may offers to buy be accepted
                                         until that series has become effective
                                         with the Securities and Exchange
                                         Commission. No units can be sold in any
                                         State where a sale would be illegal.

 
                                                      70092--8/98

                                    PART II
             ADDITIONAL INFORMATION NOT INCLUDED IN THE PROSPECTUS
 

A. The following information relating to the Depositors is incorporated by 
reference to the SEC filings indicated and made a part of this Registration 
Statement.

 
 I. Bonding arrangements of each of the Depositors are incorporated by reference
to Item A of Part II to the Registration Statement on Form S-6 under the
Securities Act of 1933 for Municipal Investment Trust Fund, Monthly Payment
Series--573 Defined Asset Funds (Reg. No. 333-08241).
 
 II. The date of organization of each of the Depositors is set forth in Item B
of Part II to the Registration Statement on Form S-6 under the Securities Act of
1933 for Municipal Investment Trust Fund, Monthly Payment Series--573 Defined
Asset Funds (Reg. No. 333-08241) and is herein incorporated by reference
thereto.
 
III. The Charter and By-Laws of each of the Depositors are incorporated herein
by reference to Exhibits 1.3 through 1.12 to the Registration Statement on Form
S-6 under the Securities Act of 1933 for Municipal Investment Trust Fund,
Monthly Payment Series--573 Defined Asset Funds (Reg. No. 333-08241).
 
IV. Information as to Officers and Directors of the Depositors has been filed
pursuant to Schedules A and D of Form BD under Rules 15b1-1 and 15b3-1 of the
Securities Exchange Act of 1934 and is incorporated by reference to the SEC
filings indicated and made a part of this Registration Statement:
 

 Merrill Lynch, Pierce, Fenner & Smith Incorporated               8-7221
 Smith Barney Inc. ........................................       8-8177
 PaineWebber Incorporated..................................      8-16267
 Dean Witter Reynolds Inc. ................................      8-14172

 
                      ------------------------------------
 
     B. The Internal Revenue Service Employer Identification Numbers of the
Sponsors and Trustee are as follows:
 

 Merrill Lynch, Pierce, Fenner & Smith Incorporated             13-5674085
 Smith Barney Inc. ........................................     13-1912900
 PaineWebber Incorporated..................................     13-2638166
 Dean Witter Reynolds Inc. ................................     94-0899825
 The Bank of New York, Trustee.............................     13-4941102

 
                                  UNDERTAKING
The Sponsors undertake that they will not instruct the Trustee to accept from
(i) Asset Guaranty Reinsurance Company, Municipal Bond Investors Assurance
Corporation or any other insurance company affiliated with any of the Sponsors,
in settlement of any claim, less than an amount sufficient to pay any principal
or interest (and, in the case of a taxability redemption, premium) then due on
any Security in accordance with the municipal bond guaranty insurance policy
attached to such Security or (ii) any affiliate of the Sponsors who has any
obligation with respect to any Security, less than the full amount due pursuant
to the obligation, unless such instructions have been approved by the Securities
and Exchange Commission pursuant to Rule 17d-1 under the Investment Company Act
of 1940.
 
                                      II-1
<PAGE>
                       CONTENTS OF REGISTRATION STATEMENT
The Registration Statement on Form S-6 comprises the following papers and
documents:
 
     The facing sheet of Form S-6.
 
     The Cross-Reference Sheet (incorporated by reference to the Cross-Reference
Sheet to the Registration Statement of Defined Asset Funds Municipal Series,
1933 Act File No. 33-54565).
 
     The Prospectus.
 
     Additional Information not included in the Prospectus (Part II).
 
The following exhibits:
 

 *1.1   --Form of Trust Indenture.
 1.1.1  --Form of Standard Terms and Conditions of Trust Effective October 21,
          1993 (incorporated by reference to Exhibit 1.1.1 to the Registration
          Statement of Municipal Investment Trust Fund, Multistate Series-48,
          1933 Act File No. 33-50247).
 1.2    --Form of Master Agreement Among Underwriters (incorporated by reference
          to Exhibit 1.2 to the Registration Statement of The Corporate Income
          Fund, One Hundred Ninety-Fourth Monthly Payment Series, 1933 Act File
          No. 2-90925).
 2.1    --Form of Certificate of Beneficial Interest (included in Exhibit
        1.1.1).
 *3.1   --Opinion of counsel as to the legality of the securities being issued
          including their consent to the use of their name under the headings
          'How The Fund Works--'Legal Opinion' in the Prospectus.
 *4.1   --Consent of the Evaluator.
 *5.1   --Consent of independent accountants.
 9.1    --Information Supplement (incorporated by reference to Exhibit 9.1 to
          the Registration Statement of Municipal Investment Trust Fund,
          Multistate Series--30, 1933 Act File No. 333-49353).

 
- ------------------------------------
 
*To be filed by amendment.
 
                                      R-1
<PAGE>
                              DEFINED ASSET FUNDS
                             MUNICIPAL DEFINED FUND
                                   SIGNATURES
 
   
     PURSUANT TO THE REQUIREMENTS OF THE SECURITIES ACT OF 1933, THE REGISTRANT
HAS DULY CAUSED THIS REGISTRATION STATEMENT OR AMENDMENT TO THE REGISTRATION
STATEMENT TO BE SIGNED ON ITS BEHALF BY THE UNDERSIGNED THEREUNTO DULY
AUTHORIZED IN THE CITY OF NEW YORK AND STATE OF NEW YORK ON THE 4TH DAY OF
AUGUST, 1998.
    
 
               SIGNATURES APPEAR ON PAGES R-3, R-4, R-5 AND R-6.
 
     A majority of the members of the Board of Directors of Merrill Lynch,
Pierce, Fenner & Smith Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.
 
     A majority of the members of the Board of Directors of Smith Barney Inc.
has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.
 
     A majority of the members of the Executive Committee of the Board of
Directors of PaineWebber Incorporated has signed this Registration Statement or
Amendment to the Registration Statement pursuant to Powers of Attorney
authorizing the person signing this Registration Statement or Amendment to the
Registration Statement to do so on behalf of such members.
 
     A majority of the members of the Board of Directors of Dean Witter Reynolds
Inc. has signed this Registration Statement or Amendment to the Registration
Statement pursuant to Powers of Attorney authorizing the person signing this
Registration Statement or Amendment to the Registration Statement to do so on
behalf of such members.
 
                                      R-2
<PAGE>
               MERRILL LYNCH, PIERCE, FENNER & SMITH INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under
  the Board of Directors of Merrill         Form SE and the following 1933 Act
  Lynch, Pierce,                            File
  Fenner & Smith Incorporated:              Number: 33-43466 and 33-51607

 
      HERBERT M. ALLISON, JR.
      BARRY S. FREIDBERG
      EDWARD L. GOLDBERG
      STEPHEN L. HAMMERMAN
      JEROME P. KENNEY
      DAVID H. KOMANSKY
      DANIEL T. NAPOLI
      THOMAS H. PATRICK
      JOHN L. STEFFENS
      ROGER M. VASEY
      ARTHUR H. ZEIKEL
      DANIEL C. TYLER
      (As authorized signatory for Merrill Lynch, Pierce,
      Fenner & Smith Incorporated and
      Attorney-in-fact for the persons listed above)
 
                                      R-3
<PAGE>
                               SMITH BARNEY INC.
                                   DEPOSITOR
 

By the following persons, who constitute a majority of      Powers of Attorney
  the Board of Directors of Smith Barney Inc.:                have been filed
                                                              under the 1933 Act
                                                              File Numbers:
                                                              33-49753,
                                                              33-55073,
                                                              333-41765 and
                                                              333-10441

 
      JAMES DIMON
      DERYCK C. MAUGHAN
 
      By GINA LEMON
       (As authorized signatory for
       Smith Barney Inc. and
       Attorney-in-fact for the persons listed above)
 
                                      R-4
<PAGE>
                            PAINEWEBBER INCORPORATED
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  the Board of Directors of PaineWebber     under
  Incorporated:                             the following 1933 Act File
                                            Number: 2-61279

 
      MARGO N. ALEXANDER
      TERRY L. ATKINSON
      BRIAN M. BAREFOOT
      STEVEN P. BAUM
      MICHAEL CULP
      REGINA A. DOLAN
      JOSEPH J. GRANO, JR.
      EDWARD M. KERSCHNER
      JAMES P. MacGILVRAY
      DONALD B. MARRON
      ROBERT H. SILVER
      MARK B. SUTTON
      By
       ROBERT E. HOLLEY
       (As authorized signatory for
       PaineWebber Incorporated
       and Attorney-in-fact for the persons listed above)
 
                                      R-5
<PAGE>
                           DEAN WITTER REYNOLDS INC.
                                   DEPOSITOR
 

By the following persons, who constitute  Powers of Attorney have been filed
  a majority of                             under Form SE and the following 1933
  the Board of Directors of Dean Witter     Act File Numbers: 33-17085 and
  Reynolds Inc.:                            333-13039

 
      RICHARD M. DeMARTINI
      ROBERT J. DWYER
      CHRISTINE A. EDWARDS
      CHARLES A. FIUMEFREDDO
      JAMES F. HIGGINS
      MITCHELL M. MERIN
      STEPHEN R. MILLER
      RICHARD F. POWERS III
      PHILIP J. PURCELL
      THOMAS C. SCHNEIDER
      WILLIAM B. SMITH
      By
       MICHAEL D. BROWNE
       (As authorized signatory for
       Dean Witter Reynolds Inc.
       and Attorney-in-fact for the persons listed above)
 
                                      R-6



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