[an.trum] n, pl an.tra [LL, fr. L, cave, fr. Gk antron; akin to Arm ayr cave] (ca. 1751): the cavity of a hollow organ or a sinus -- an.tral adj
ANTRUM
Meaning of ANTRUM in English
Merriam-Webster English vocab. Английский словарь Merriam Webster. 2012