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chorion

[kawr-ee-on, kohr-] /ˈkɔr iˌɒn, ˈkoʊr-/
noun
1.
Embryology. the outermost of the extraembryonic membranes of land vertebrates, contributing to the formation of the placenta in the placental mammals.
2.
Zoology. the membrane around the eggs of certain insects, secreted by cells of the ovary.
Origin
1535-1545
1535-45; < New Latin < Greek chórion membrane enclosing the fetus
Related forms
chorionic, chorial, adjective
subchorionic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for chorion

chorion

/ˈkɔːrɪən/
noun
1.
the outer of two membranes that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammals See also amnion
Derived Forms
chorionic, chorial, adjective
Word Origin
C16: from Greek khorion afterbirth
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 chorion
n.

"outer membrane of the fetus," 1540s, medical Latin, from Greek khorion "membrane enclosing the fetus, afterbirth," perhaps from PIE *ghere- "gut, entrail" (see yarn).

Online Etymology Dictionary, © 2010 Douglas Harper
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chorion in Medicine

chorion cho·ri·on (kôr'ē-ŏn')
n.
The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.


cho'ri·on'ic (-ŏn'ĭk) adj.
The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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chorion in Science
chorion
  (kôr'ē-ŏn')   
The outer membrane that encloses the embryo of a reptile, bird, or mammal. In mammals, the chorion contributes to the development of the placenta.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for chorion

in reptiles, birds, and mammals, the outermost membrane around the embryo. It develops from an outer fold on the surface of the yolk sac. In insects the chorion is the outer shell of the insect egg.

Learn more about chorion with a free trial on Britannica.com
Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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