• synonyms


[an-truh m]
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noun, plural an·tra [an-truh] /ˈæn trə/. Anatomy.
  1. a cavity in a body organ, especially a bone.
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Origin of antrum

1720–30; < Latin < Greek ántron cave
Related formsan·tral, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Related Words

recess, opening, hollow, pocket, channel, depression, antrum

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Historical Examples

British Dictionary definitions for antrum


noun plural -tra (-trə)
  1. anatomy a natural cavity, hollow, or sinus, esp in a bone
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Derived Formsantral, 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

Word Origin and History for antrum


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

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Online Etymology Dictionary, © 2010 Douglas Harper

antrum in Medicine


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.
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Related formsantral (-trəl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.