[ il-ee-uhm ]
See synonyms for ileum on
noun,plural il·e·a [il-ee-uh]. /ˈɪl i ə/.
  1. Anatomy. the third and lowest division of the small intestine, extending from the jejunum to the cecum.

  2. Zoology. the anterior portion of the hindgut of an insect or other arthropod.

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Origin of ileum

1675–85; <New Latin, Medieval Latin īleum, variant of Latin īlia (neuter plural) side of the body between hips and groin, guts, apparently by confusion with Latin īleusileus

Other words from ileum

  • il·e·al, adjective

Words that may be confused with ileum

Words Nearby ileum Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

How to use ileum in a sentence

British Dictionary definitions for ileum


/ (ˈɪlɪəm) /

  1. the part of the small intestine between the jejunum and the caecum

  2. the corresponding part in insects

Origin of ileum

C17: New Latin, from Latin īlium, īleum flank, groin, of obscure origin

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


[ ĭlē-əm ]

Plural ilea
  1. The lower part of the small intestine, connecting the jejunum to the cecum of the large intestine.

Other words from ileum

  • ileal adjective

The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.