[an-truh m]

noun, plural an·tra [an-truh] /ˈæn trə/. Anatomy.

a cavity in a body organ, especially a bone.

Origin of antrum

1720–30; < Latin < Greek ántron cave
Related formsan·tral, adjective Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Related Words for antrum

recess, opening, hollow, pocket, channel, depression

Examples from the Web for antrum

Historical Examples of antrum

British Dictionary definitions for antrum


noun plural -tra (-trə)

anatomy a natural cavity, hollow, or sinus, esp in a bone
Derived Formsantral, adjective

Word Origin for antrum

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."

Online Etymology Dictionary, © 2010 Douglas Harper

antrum in Medicine



n. pl. an•tra (-trə)

A nearly closed cavity or chamber, especially in a bone.
The pyloric end of the stomach, partially shut off during digestion from the cardiac end by sphincter muscles in the stomach wall.
Related formsantral (-trəl) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.