(ăn′trŭm)
[Pronunciation]
pl. [L., cavity]

Any nearly closed cavity or chamber, esp. in a bone.

antral, (-trăl)
[Pronunciation]
adj.

Subentries:
duodenal antrum
gastric antrum
antrum of Highmore
mastoid antrum
maxillary antrum
puncture of the antrum
pyloric antrum
tympanic antrum