Definify.com
Webster 1913 Edition
Capitulum
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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.
[See Illust. of
Artiodactyla
.]