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chorion

 - 5 dictionary results

cho⋅ri⋅on

  [kawr-ee-on, kohr-]
Use chorion in a Sentence
–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:
1535–45; < NL < Gk chórion membrane enclosing the fetus

Related forms:
cho⋅ri⋅on⋅ic, cho⋅ri⋅al, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2009.
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cho·ri·on   (kôr'ē-ŏn', kōr'-)   
n.  The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.

[Greek khorion; see gherə- in Indo-European roots.]
cho'ri·on'ic (-ŏn'ĭk) adj.
The American Heritage® Dictionary of the English Language, Fourth Edition
Copyright © 2009 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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Medical Dictionary

Main Entry: cho·ri·on
Pronunciation: 'kOr-E-"än, 'kor-
Function: noun
: the highly vascular outer embryonic membrane that is associatedwith the allantois in the formation of the placenta
Merriam-Webster's Medical Dictionary, © 2002 Merriam-Webster, Inc.
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Medical Dictionary

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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Encyclopedia

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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