antra

Variant of antrum

antrum definition

an·trum (an′trəm)

noun pl. antra -·tra (-trə) or antrums -·trums

Anat. a cavity, esp. one within a bone, as either of a pair of sinuses in the upper jaw

Etymology: L < Gr antron, cave < IE *antrom

Webster's New World College Dictionary Copyright © 2009 by Wiley Publishing, Inc., Cleveland, Ohio.
Used by arrangement with John Wiley & Sons, Inc.

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