1. [NA]. Any nearly closed cavity, particularly one with bony walls.
2. Syn: pyloric antrum.
Origin
[L. fr. G. antron, a cave]
antrum auris
antrum cardiacum
antra ethmoidalia
follicular antrum
antrum of Highmore
mastoid antrum
antrum mastoideum
maxillary antrum
pyloric antrum
antrum pyloricum
tympanic antrum
Valsalva’s antrum