il·​e·​um | \ ˈi-lē-əm How to pronounce ileum (audio) \
plural ilea\ ˈi-​lē-​ə How to pronounce ileum (audio) \

Definition of ileum

: the last division of the small intestine extending between the jejunum and large intestine

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Other Words from ileum

ileal \ ˈi-​lē-​əl How to pronounce ileum (audio) \ adjective

Examples of ileum in a Sentence

Recent Examples on the Web The chance of making that diagnosis goes up markedly when the terminal ileum is included. Lisa Sanders, New York Times, 15 Sep. 2020 Nicholas' ileum, the final section of his small intestine, is full of pus and ulcers. Mark Johnson And Kathleen Gallagher, Milwaukee Journal Sentinel, 21 Dec. 2010 The ileum is not scoped during a routine screening because doing so takes more time and because the chance of finding something significant is small. Lisa Sanders, New York Times, 15 Sep. 2020 View Sample Sign Up Now Instead, the sugar and other components of fruit quickly move farther down the small intestine to the jejunum and ileum. Markham Heid, Time, 6 June 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'ileum.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of ileum

1682, in the meaning defined above

History and Etymology for ileum

New Latin, alteration of Latin ilia, plural, groin, viscera

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Cite this Entry

“Ileum.” Dictionary, Merriam-Webster, Accessed 20 Sep. 2021.

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More Definitions for ileum


il·​e·​um | \ ˈil-ē-əm How to pronounce ileum (audio) \
plural ilea\ -​ē-​ə How to pronounce ileum (audio) \

Medical Definition of ileum

: the last division of the small intestine that constitutes the part between the jejunum and large intestine and in humans forms the last three fifths of the part of the small intestine beyond the end of the duodenum and that is smaller and thinner-walled than the jejunum with fewer circular folds but more numerous Peyer's patches

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