chorion

[ kawr-ee-on, kohr- ]
/ ˈkɔr iˌɒn, ˈkoʊr- /
|

noun

Embryology. the outermost of the extraembryonic membranes of land vertebrates, contributing to the formation of the placenta in the placental mammals.
Zoology. the membrane around the eggs of certain insects, secreted by cells of the ovary.

Nearby words

  1. chorioid,
  2. chorioid-,
  3. chorioido-,
  4. chorioma,
  5. choriomeningitis,
  6. chorionic epithelioma,
  7. chorionic gonadotrophin,
  8. chorionic gonadotropin,
  9. chorionic growth hormone-prolactin,
  10. chorionic villus

Origin of chorion

1535–45; < New Latin < Greek chórion membrane enclosing the fetus

Related formscho·ri·on·ic, cho·ri·al, adjectivesub·cho·ri·on·ic, adjective

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for chorion


British Dictionary definitions for chorion

chorion

/ (ˈkɔːrɪən) /

noun

the outer of two membranes that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammalsSee also amnion
Derived Formschorionic or chorial, adjective

Word Origin for chorion

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

Word Origin and History for chorion

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

Medicine definitions for chorion

chorion

[ kôrē-ŏn′ ]

n.

The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.
Related formscho′ri•onic (-ŏnĭk) adj.


The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.

Science definitions for chorion

chorion

[ kôrē-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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.