chorion

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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.

[Greek khorion; see gherə- in Indo-European roots.]

cho′ri·on′ic (-ŏn′ĭk) adj.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

chorion

(ˈkɔːrɪən)
n
(Anatomy) 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
[C16: from Greek khorion afterbirth]
ˌchoriˈonic, ˈchorial adj
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014

cho•ri•on

(ˈkɔr iˌɒn, ˈkoʊr-)

n.
1. the outermost of the membranes enclosing the embryo in reptiles, birds, and mammals, developing into part of the eggshell or part of the placenta.
2. a membrane enclosing the shell of an insect egg.
[1535–45; < Greek chórion afterbirth]
cho`ri•on′ic, cho′ri•al, adj.
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.

cho·ri·on

(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® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

chorion

The embryo’s outer membrane, which helps to form the placenta.
Dictionary of Unfamiliar Words by Diagram Group Copyright © 2008 by Diagram Visual Information Limited
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.chorion - the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
amniote - any member of the Amniota
chorionic villus - one of the tiny villi that stick out of the fetal chorion and combine with the mother's uterine tissue to form the placenta
mammal, mammalian - any warm-blooded vertebrate having the skin more or less covered with hair; young are born alive except for the small subclass of monotremes and nourished with milk
fetal membrane - any membrane that functions for the protection or nourishment or respiration or excretion of a developing fetus
sac - a structure resembling a bag in an animal
Based on WordNet 3.0, Farlex clipart collection. © 2003-2012 Princeton University, Farlex Inc.
Translations

cho·ri·on

n. corión, una de las dos membranas que rodean al feto.
English-Spanish Medical Dictionary © Farlex 2012