What does chorion mean?

Definitions for chorion
ˈkɔr iˌɒn, ˈkoʊr-chori·on

This dictionary definitions page includes all the possible meanings, example usage and translations of the word chorion.

Princeton's WordNet

  1. chorionnoun

    the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)


  1. chorionnoun

    The protective and nutritive membrane that attaches higher vertebrate fetuses to the uterus.

  2. chorionnoun

    The outer case of an insect egg.

  3. chorionnoun

    The outer membrane of seeds of plants.

Samuel Johnson's Dictionary

  1. Chorionnoun

    The outward membrane that enwraps the fœtus.

    Etymology: χωϱεῖν, to contain.


  1. Chorion

    The chorion is the outermost fetal membrane around the embryo in mammals, birds and reptiles (amniotes). It develops from an outer fold on the surface of the yolk sac, which lies outside the zona pellucida (in mammals), known as the vitelline membrane in other animals. In insects it is developed by the follicle cells while the egg is in the ovary.


  1. chorion

    The chorion is a membrane that develops around an embryo in mammals, birds, and reptiles, playing a crucial role in embryogenesis by contributing to the formation of placenta in mammals and to gas exchange in eggs of bird and reptiles. In humans, it is the outermost layer of the embryonic sac, which with the mother's endometrium forms the placenta.

Webster Dictionary

  1. Chorionnoun

    the outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development

  2. Chorionnoun

    the true skin, or cutis

  3. Chorionnoun

    the outer membrane of seeds of plants

  4. Etymology: [NL., fr. Gr. .]


  1. Chorion

    The chorion is one of the membranes that exist during pregnancy between the developing fetus and mother. It is formed by extraembryonic mesoderm and the two layers of trophoblast and surrounds the embryo and other membranes. The chorionic villi emerge from the chorion, invade the endometrium, and allow transfer of nutrients from maternal blood to fetal blood.

Chambers 20th Century Dictionary

  1. Chorion

    kō′ri-on, n. the outer fœtal envelope: the external membrane of the seeds of plants:—pl. Chō′ria.—adj. Chō′roid. [Gr.]

U.S. National Library of Medicine

  1. Chorion

    The outermost extra-embryonic membrane surrounding the developing embryo. In REPTILES and BIRDS, it adheres to the shell and allows exchange of gases between the egg and its environment. In MAMMALS, the chorion evolves into the fetal contribution of the PLACENTA.


  1. Chorion

    the shell or covering membrane of an insect egg.

Matched Categories

How to pronounce chorion?

How to say chorion in sign language?


  1. Chaldean Numerology

    The numerical value of chorion in Chaldean Numerology is: 3

  2. Pythagorean Numerology

    The numerical value of chorion in Pythagorean Numerology is: 1

Popularity rank by frequency of use


Translations for chorion

From our Multilingual Translation Dictionary

Get even more translations for chorion »


Find a translation for the chorion definition in other languages:

Select another language:

  • - Select -
  • 简体中文 (Chinese - Simplified)
  • 繁體中文 (Chinese - Traditional)
  • Español (Spanish)
  • Esperanto (Esperanto)
  • 日本語 (Japanese)
  • Português (Portuguese)
  • Deutsch (German)
  • العربية (Arabic)
  • Français (French)
  • Русский (Russian)
  • ಕನ್ನಡ (Kannada)
  • 한국어 (Korean)
  • עברית (Hebrew)
  • Gaeilge (Irish)
  • Українська (Ukrainian)
  • اردو (Urdu)
  • Magyar (Hungarian)
  • मानक हिन्दी (Hindi)
  • Indonesia (Indonesian)
  • Italiano (Italian)
  • தமிழ் (Tamil)
  • Türkçe (Turkish)
  • తెలుగు (Telugu)
  • ภาษาไทย (Thai)
  • Tiếng Việt (Vietnamese)
  • Čeština (Czech)
  • Polski (Polish)
  • Bahasa Indonesia (Indonesian)
  • Românește (Romanian)
  • Nederlands (Dutch)
  • Ελληνικά (Greek)
  • Latinum (Latin)
  • Svenska (Swedish)
  • Dansk (Danish)
  • Suomi (Finnish)
  • فارسی (Persian)
  • ייִדיש (Yiddish)
  • հայերեն (Armenian)
  • Norsk (Norwegian)
  • English (English)

Word of the Day

Would you like us to send you a FREE new word definition delivered to your inbox daily?

Please enter your email address:


Use the citation below to add this definition to your bibliography:


"chorion." Definitions.net. STANDS4 LLC, 2023. Web. 3 Dec. 2023. <https://www.definitions.net/definition/chorion>.

Discuss these chorion definitions with the community:


    Are we missing a good definition for chorion? Don't keep it to yourself...

    Image or illustration of


    Credit »

    Free, no signup required:

    Add to Chrome

    Get instant definitions for any word that hits you anywhere on the web!

    Free, no signup required:

    Add to Firefox

    Get instant definitions for any word that hits you anywhere on the web!

    Browse Definitions.net


    Are you a words master?

    something (a term or expression or concept) that has a reciprocal relation to something else
    • A. contempt
    • B. reciprocal
    • C. tingle
    • D. encumbrance

    Nearby & related entries:

    Alternative searches for chorion: