chorion

[ kawr-ee-on, kohr- ]

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 of chorion

1
1535–45; <New Latin <Greek chórion membrane enclosing the fetus

Other words from chorion

  • cho·ri·on·ic, cho·ri·al, adjective
  • sub·cho·ri·on·ic, adjective

Words Nearby chorion

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How to use chorion in a sentence

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

Origin of chorion

1
C16: from Greek khorion afterbirth

Derived forms of chorion

  • chorionic or chorial, adjective

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

Scientific definitions for chorion

chorion

[ kôrē-ŏn′ ]


  1. The outer membrane that encloses the embryo of a reptile, bird, or mammal. In mammals, the chorion contributes to the development of the placenta.

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