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
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
noun plural -tra (-trə)
anatomy a natural cavity, hollow, or sinus, esp in a bone
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
"a cave or cavity," late 14c., medical Latin, from Greek antron "cave."
Online Etymology Dictionary, © 2010 Douglas Harper
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.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.