Source : Webster's Revised Unabridged Dictionary (1913)

Coxcomb \Cox"comb`\ (k?ks"k?m`), n. [A corrupted spelling of
   cock's comb.]
   1.
      (a) A strip of red cloth notched like the comb of a cock,
          which licensed jesters formerly wore in their caps.
      (b) The cap itself.

   2. The top of the head, or the head itself.

            We will belabor you a little better, And beat a
            little more care into your coxcombs.  --Beau & Fl.

   3. A vain, showy fellow; a conceited, silly man, fond of
      display; a superficial pretender to knowledge or
      accomplishments; a fop.

            Fond to be seen, she kept a bevy Of powdered
            coxcombs at her levee.                --Goldsmith.

            Some are bewildered in the maze of schools, And some
            made coxcombs, nature meant but fools. --Pope.

   4. (Bot.) A name given to several plants of different genera,
      but particularly to {Celosia cristata}, or garden
      cockscomb. Same as {Cockscomb}.

Source : WordNet®

coxcomb
     n 1: a conceited dandy who is overly impressed by his own
          accomplishments [syn: {cockscomb}]
     2: a cap worn by court jesters; adorned with a strip of red
        [syn: {cockscomb}]
     3: the fleshy red crest on the head of the domestic fowl and
        other gallinaceous birds [syn: {comb}, {cockscomb}]