Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. Anatomy The rounded protuberance at the lower end of the humerus that articulates with the radius.

from The Century Dictionary and Cyclopedia

  • n. In anatomy: The rounded convex articular eminence upon the distal extremity of the humerus (capitellum humeri), which is received in the cup-shaped head of the radius.
  • n. The head of a rib (capitellum costæ), as distinguished from the tuberculum or shoulder. Also called capitulum.
  • n. In zoology, the tentacular portion of the body or the hydranth of a hydroid polyp; that part of the hydranth which bears tentacles and appears to be analogous to a head.

Etymologies

Late Latin, diminutive of Latin caput, capit-, head; see kaput- in Indo-European roots.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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