capitulum noun. [kǝ'pɪtjʊlǝm] Pl. -la [-lǝ]. E18.
[Latin, dim. of caput, capit- head: see -ULE.]
A small rounded head or knob; esp. (a) Anatomy a bony protuberance articulating with another bone, esp. the prominence at the end of the humerus which articulates with the radius; (b) Botany a dense flat terminal cluster of sessile flowers or florets on a common receptacle, as in the composite family.

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