Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

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

from The Century Dictionary.

  • noun 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.
  • noun The head of a rib (capitellum costæ), as distinguished from the tuberculum or shoulder. Also called capitulum.
  • noun 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

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

[Late Latin, diminutive of Latin caput, capit-, head; see kaput- in Indo-European roots.]

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