capitate

1. Anatomy. Enlarged and globular at the tip, as a bone of the wrist having a rounded knoblike end.
2. Botany. Forming a headlike mass or dense cluster, as the flowers of plants in the composite family.

[Latin capitātus, having a head, from caput, capit-, head.]

The largest bone of the wrist which articulates with the trapezoid and hamates laterally and medially; the second, third, and fourth metacarpals in front; and the scaphoid and lunette bones behind (see corpus).

Enlarged and globular at the tip, as a bone of the wrist having a rounded, knoblike end.

Forming a dense compact head of flowers, as in the alliums.

The noun has one meaning:

Meaning #1: the wrist bone with a rounded head shape that articulates with the 3rd metatarsal
  Synonyms: capitate bone, os capitatum

The adjective capitate has one meaning:

Meaning #1: (biology) being abruptly enlarged and globose at the tip