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antrum

Noun

an=trum

WORDNET DICTIONARY

antrum, n. [L., fr. Gr. .].

A cavern or cavity, esp. an anatomical cavity or sinus Huxley. [1913 Webster]

antrum, n. (pl. antra) Anat. a natural chamber or cavity in the body, esp. in a bone.

Derivative

antral adj.

Etymology

L f. Gk antron cave

For further exploring for "antrum" in Webster Dictionary Online