noun, plural coeloms, coelomata [si-loh-muh-tuh] . Zoology.
the body cavity of higher metazoans, between the body wall and intestine, lined with a mesodermal epithelium.
Also, coelome [see-lohm] , celom.

1875–80; < Greek koílōma cavity, equivalent to koilō-, variant stem of koiloûn to hollow out (verbal derivative of koîlos hollow) + -ma noun suffix denoting result

coelomic [si-lom-ik, -loh-mik] , adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
coelom or celom (ˈsiːləʊm, -ləm, ˈsiːləʊm, -ləm)
the body cavity of many multicellular animals, situated in the mesoderm and containing the digestive tract and other visceral organs
[C19: from Greek koilōma cavity, from koilos hollow; see coel-]
celom or celom
[C19: from Greek koilōma cavity, from koilos hollow; see coel-]
coelomic or celom
celomic or celom

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Medical Dictionary

coelom coe·lom or ce·lom or coe·lome (sē'ləm)
The cavity formed by the splitting of the embryonic mesoderm into two layers; in mammals it then forms into the peritoneal, pleural, and pericardial cavities.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
coelom  [%PREMIUM_LINK%]     (sē'ləm)  Pronunciation Key 
The body cavity that forms from the mesoderm during the embryonic development of more complex animals. The coelom suspends the gut in fluid in the middle of the body, protecting it from gravity and allowing great increases in body size. The presence or absence of a coelom is important for the classification of animal phyla. See more at deuterostome, protostome.

The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The left flank was aseptically prepared, and a standard approach was made to the coelom behind the last rib.
Endoscopy through the air sac also made it possible to check the major veins in the coelom.
In mammals, the coelom forms the peritoneal, pleural, and pericardial cavities.
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