C c


    • US Pronunciation
    • US IPA
    • UK Pronunciation
    • UK IPA
    • [kawr-ee-on, kohr-]
    • /ˈkɔr iˌɒn, ˈkoʊr-/
    • /kˈɔːriən/
    • US Pronunciation
    • US IPA
    • [kawr-ee-on, kohr-]
    • /ˈkɔr iˌɒn, ˈkoʊr-/

Definitions of chorion word

  • noun chorion the outer of two membranes that form a sac around the embryonic reptile, bird, or mammal: contributes to the placenta in mammals 3
  • noun chorion the outermost of the two membranes that completely envelop a fetus 3
  • noun chorion the outer membrane or shell of the eggs of insects and other invertebrates 3
  • noun chorion Embryology. the outermost of the extraembryonic membranes of land vertebrates, contributing to the formation of the placenta in the placental mammals. 1
  • noun chorion Zoology. the membrane around the eggs of certain insects, secreted by cells of the ovary. 1
  • noun chorion The outermost membrane surrounding an embryo of a reptile, bird, or mammal. In mammals (including humans), it contributes to the formation of the placenta. 1

Information block about the term

Origin of chorion

First appearance:

before 1535
One of the 29% oldest English words
1535-45; < New Latin < Greek chórion membrane enclosing the fetus

Historical Comparancy

Parts of speech for Chorion


chorion popularity

A common word. It’s meaning is known to most children of preschool age. About 79% of English native speakers know the meaning and use the word.
This word is included in each student's vocabulary. Most likely there is at least one movie with this word in the title.

chorion usage trend in Literature

This diagram is provided by Google Ngram Viewer

Top questions with chorion

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See also

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