Source : Webster's Revised Unabridged Dictionary (1913)

Cauliflower \Cau"li*flow`er\, n. [F. choufleur, modified by E.
   Cole. L. caulis, and by E. flower; F. chou cabbage is fr. L.
   caulis stalk, cabbage, and fleur flower is fr. L. flos
   flower. See {Cole}, and {Flower}.]
   1. (Bot.) An annual variety of {Brassica oleracea}, or
      cabbage, of which the cluster of young flower stalks and
      buds is eaten as a vegetable.

   2. The edible head or ``curd'' of a cauliflower plant.

Source : WordNet®

cauliflower
     n 1: a plant having a large edible head of crowded white flower
          buds [syn: {Brassica oleracea botrytis}]
     2: compact head of white undeveloped flowers