Anatomy. the third and lowest division of the small intestine, extending from the jejunum to the cecum.
Zoology. the anterior portion of the hindgut of an insect or other arthropod.
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- il·e·al, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
How to use ileum in a sentence
The solitary glands are frequently enlarged and ulcerated, like those of the ileum.
In two instances he found a layer of diphtheritic deposit over the mucous membrane of the lower part of the ileum.
This arrangement prevents the passing of substances from the colon into the ileum.
The ileum terminates near the right haunch-bone, by a valvular opening into the colon at an obtuse angle.
The term ileum is from the Greek, signifying “to twist,” since it always appears in a contorted condition.
British Dictionary definitions for ileum
the part of the small intestine between the jejunum and the caecum
the corresponding part in insects
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
Scientific definitions for ileum
The lower part of the small intestine, connecting the jejunum to the cecum of the large intestine.
- ileal adjective
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.