noun, plural antra [an-truh] . Anatomy.
a cavity in a body organ, especially a bone.

1720–30; < Latin < Greek ántron cave

antral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antrum (ˈæntrəm)
n , pl -tra
anatomy a natural cavity, hollow, or sinus, esp in a bone
[C14: from Latin: cave, from Greek antron]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Word Origin & History

"a cave or cavity," late 14c., medical L., from Gk. antron "cave."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

antrum an·trum (ān'trəm)
n. pl. an·tra (-trə)

  1. A nearly closed cavity or chamber, especially in a bone.

  2. The pyloric end of the stomach, partially shut off during digestion from the cardiac end by sphincter muscles in the stomach wall.

an'tral (-trəl) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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Example sentences
During the sixth or seventh month the tympanic antrum appears as an upward and backward expansion of the tympanic cavity.
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