Nearby Words
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; < Neo-Latin < Greek chórion membrane enclosing the fetus
1535–45; < Neo-Latin < Greek chórion membrane enclosing the fetus
Related forms
cho·ri·on·ic, cho·ri·al, adjective
sub·cho·ri·on·ic, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2012.
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Based on the Random House Dictionary, © Random House, Inc. 2012.
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Chorion
is always a great word to know.
So is callithumpian. Does it mean:
| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a children's mummer's parade, as on the Fourth of July, with prizes for the best costumes. |
Collins
World English Dictionary
| chorion (ˈkɔːrɪən) | |
| —n | |
| See also amnion the outer of two membranes that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammals | |
| [C16: from Greek khorion afterbirth] | |
| chori'onic | |
| —adj | |
| 'chorial | |
| —adj | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History
chorion
"outer membrane of the fetus," 1540s, from Gk. khorion "membrane enclosing the fetus, afterbirth," perhaps from PIE *ghere- "gut, entrail."
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
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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Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
chorion  (kôr'ē-ŏn') Pronunciation Key
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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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
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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