Capitulum

1. n. A knoblike protuberance of any part, esp. at the end of a bone or cartilage. [See Illust. of Artiodactyla.]
2. n. 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.

The word meanings were obtained from OPTED(The Online Plain Text English Dictionary), which is based on “The Project Gutenberg Etext of Webster’s Unabridged Dictionary” which is in turn based on the 1913 US Webster’s Unabridged Dictionary (See Project Gutenburg), as a text file.