Source : Webster's Revised Unabridged Dictionary (1913)

Fool \Fool\, n. [Cf. F. fouler to tread, crush. Cf. 1st {Foil}.]
   A compound of gooseberries scalded and crushed, with cream;
   -- commonly called gooseberry fool.

Fool \Fool\, n. [OE. fol, n. & adj., F. fol, fou, foolish, mad;
   a fool, prob. fr. L. follis a bellows, wind bag, an inflated
   ball; perh. akin to E. bellows. Cf. {Folly}, {Follicle}.]
   1. One destitute of reason, or of the common powers of
      understanding; an idiot; a natural.

   2. A person deficient in intellect; one who acts absurdly, or
      pursues a course contrary to the dictates of wisdom; one
      without judgment; a simpleton; a dolt.

            Extol not riches, then, the toil of fools. --Milton.

            Experience keeps a dear school, but fools will learn
            in no other.                          --Franklin.

   3. (Script.) One who acts contrary to moral and religious
      wisdom; a wicked person.

            The fool hath said in his heart, There is no God.
                                                  --Ps. xiv. 1.

   4. One who counterfeits folly; a professional jester or
      buffoon; a retainer formerly kept to make sport, dressed
      fantastically in motley, with ridiculous accouterments.

            Can they think me . . . their fool or jester?
                                                  --Milton.

   {April fool}, {Court fool}, etc. See under {April}, {Court},
      etc.

   {Fool's cap}, a cap or hood to which bells were usually
      attached, formerly worn by professional jesters.

   {Fool's errand}, an unreasonable, silly, profitless adventure
      or undertaking.

   {Fool's gold}, iron or copper pyrites, resembling gold in
      color.

   {Fool's paradise}, a name applied to a limbo (see under
      {Limbo}) popularly believed to be the region of vanity and
      nonsense. Hence, any foolish pleasure or condition of vain
      self-satistaction.

   {Fool's parsley} (Bot.), an annual umbelliferous plant
      ({[AE]thusa Cynapium}) resembling parsley, but nauseous
      and poisonous.

   {To make a fool of}, to render ridiculous; to outwit; to
      shame. [Colloq.]

   {To play the fool}, to act the buffoon; to act a foolish
      part. ``I have played the fool, and have erred
      exceedingly.'' --1 Sam. xxvi. 21.

Fool \Fool\, v. i. [imp. & p. p. {Fooled}; p. pr. & vb. n.
   {Fooling}.]
   To play the fool; to trifle; to toy; to spend time in idle
   sport or mirth.

Fool \Fool\, v. t.
   1. To infatuate; to make foolish. --Shak.

            For, fooled with hope, men favor the deceit.
                                                  --Dryden.

   2. To use as a fool; to deceive in a shameful or mortifying
      manner; to impose upon; to cheat by inspiring foolish
      confidence; as, to fool one out of his money.

            You are fooled, discarded, and shook off By him for
            whom these shames ye underwent.       --Shak.

   {To fool away}, to get rid of foolishly; to spend in trifles,
      idleness, folly, or without advantage.

Source : WordNet®

fool
     n 1: a person who lacks good judgment [syn: {sap}, {saphead}, {muggins},
           {tomfool}]
     2: a person who is gullible and easy to take advantage of [syn:
         {chump}, {gull}, {mark}, {patsy}, {fall guy}, {sucker}, {soft
        touch}, {mug}]
     3: a professional clown employed to entertain a king or
        nobleman in the middle ages [syn: {jester}, {motley fool}]

fool
     v 1: make a fool or dupe of [syn: {gull}, {befool}]
     2: spend frivolously and unwisely; "Fritter away one's
        inheritance" [syn: {fritter}, {frivol away}, {dissipate},
        {shoot}, {fritter away}, {fool away}]
     3: fool or hoax; "The immigrant was duped because he trusted
        everyone"; "You can't fool me!" [syn: {gull}, {dupe}, {slang},
         {befool}, {cod}, {put on}, {take in}, {put one over}, {put
        one across}]
     4: indulge in horseplay; "Enough horsing around--let's get back
        to work!"; "The bored children were fooling about" [syn: {horse
        around}, {arse around}, {fool around}]

Source : Free On-Line Dictionary of Computing

FOOL
     
        Fool's Lisp.  A small {Scheme} {interpreter}.
     
        {(ftp://scam.berkeley.edu/src/local/fools.tar.Z)}.
     
        (1994-10-04)