Antrum

·noun A cavern or cavity, ·esp. an anatomical cavity or sinus.

antrum
antrum, i, n., = ἄντρον, a cave, cavern, grotto (almost entirely confined to the poets). I Lit.: s...

A New Latin Dictionary by Charlton T. Lewis Ph.D. and Charles Short, LL. D.
antrum
antrum ī, n , ἄντρον, a cave, cavern, grotto (poet.): gelida antra, V.: sylvestria, O.: Pierium, H....

An Elementary Latin Dictionary