Source : Webster's Revised Unabridged Dictionary (1913)

Capitulum \Ca*pit"u*lum\, n.; pl. {Capitula}. [L., a small
   head.]
   1. A thick head of flowers on a very short axis, as a clover
      top, or a dandelion; a composite flower. A capitulum may
      be either globular or flat. --Gray.

   2. (Anat.) A knoblike protuberance of any part, esp. at the
      end of a bone or cartilage.

   Note: [See Illust. of {Artiodactyla}.]

Source : WordNet®

capitulum
     n 1: a dense clusters of flowers or foliage; "a head of
          cauliflower"; "a head of lettuce" [syn: {head}]
     2: fruiting spike of a cereal plant especially corn [syn: {ear},
         {spike}]
     3: the upper branches and leaves of a tree [syn: {crown}, {treetop}]
     [also: {capitula} (pl)]