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[an-truh m] /ˈæn trəm/
noun, plural antra
[an-truh] /ˈæn trə/ (Show IPA).
a cavity in a body organ, especially a bone.
Origin of antrum
1720-30; < Latin < Greek ántron cave
Related forms
antral, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for antral


noun (pl) -tra (-trə)
(anatomy) a natural cavity, hollow, or sinus, esp in a bone
Derived Forms
antral, adjective
Word Origin
C14: from Latin: cave, from Greek antron
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for antral



"a cave or cavity," late 14c., medical Latin, from Greek antron "cave."

Online Etymology Dictionary, © 2010 Douglas Harper
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antral in Medicine

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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