antrum

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antrum

Anatomy a natural cavity, hollow, or sinus, esp in a bone
Collins Discovery Encyclopedia, 1st edition © HarperCollins Publishers 2005

antrum

[′an·trəm]
(anatomy)
A cavity of a hollow organ or a sinus.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.