antrum
noun
an·trum ˈan-trəm 
plural antra ˈan-trə
: an anatomical cavity within a bone (such as the maxilla) or hollow organ (such as the stomach)
antral
ˈan-trəl
adjective 
Word History
Etymology
Late Latin, from Latin, cave, from Greek antron; akin to Armenian ayr cave
First Known Use
1684, in the meaning defined above
Medical Definition
antrum
noun
an·trum ˈan-trəm
plural antra -trə
: a cavity within a bone (as the maxilla) or hollow organ (as the stomach)
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