A small head or head-like structure; in anatomy, the rounded knob at the end of a bone (like on the humerus); in botany, a dense flower cluster.
From Latin capitellum (diminutive of caput, 'head'). Literally means 'little head' and is used in both anatomy and botany.
Your arm bone has a capitellum—it's the little rounded knob that forms part of your elbow joint! Medieval anatomists named it perfectly because it's literally a tiny head-shaped bone sitting on the end of your humerus.
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