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[ji-joo-nuh m] /dʒɪˈdʒu nəm/
noun, Anatomy.
the middle portion of the small intestine, between the duodenum and the ileum.
Origin of jejunum
1350-1400; Middle English < Latin jējūnum, noun use of neuter of jējūnus empty, poor, mean; so called because thought to be empty after death
Related forms
jejunal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2018.
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British Dictionary definitions for jejunum


the part of the small intestine between the duodenum and the ileum
Derived Forms
jejunal, adjective
Word Origin
C16: from Latin, from jējūnus empty; from the belief that the jejunum is empty after death
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
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Word Origin and History for jejunum

late 14c., from Latin ieiunum, neuter of ieiunus (see jejune). Translating Greek nestis (Galen). So called because it typically is found empty during dissections, perhaps because it would tend to drain in a body laid on its back.

Online Etymology Dictionary, © 2010 Douglas Harper
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jejunum in Medicine

jejunum je·ju·num (jə-jōō'nəm)
n. pl je·ju·na (-nə)
The section of the small intestine between the duodenum and the ileum.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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jejunum in Science
Plural jejuna
The middle part of the small intestine, connecting the duodenum and the ileum.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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