antrum

from WordNet (r) 3.0 (2006)
antrum
    n 1: a natural cavity or hollow in a bone
from The Collaborative International Dictionary of English v.0.48
Antrum \An"trum\, n.; pl. {Antra}. [L., fr. Gr. ?.]
   A cavern or cavity, esp. an anatomical cavity or sinus.
   --Huxley.
   [1913 Webster]
antiflux / dictionary / antrum
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