chorion
Americannoun
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Embryology. the outermost of the extraembryonic membranes of land vertebrates, contributing to the formation of the placenta in the placental mammals.
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Zoology. the membrane around the eggs of certain insects, secreted by cells of the ovary.
noun
Other Word Forms
Etymology
Origin of chorion
1535–45; < New Latin < Greek chórion membrane enclosing the fetus
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
The chorion facilitates exchange of oxygen and carbon dioxide between the embryo and the egg’s external environment.
From Textbooks ● Jan. 1, 2015
The development of the chorion will be discussed in more detail shortly, as it relates to the growth and development of the placenta.
From Textbooks ● Jun. 19, 2013
The mechanism of gas exchange at the chorion is similar to gas exchange at the respiratory membrane.
From Textbooks ● Jun. 19, 2013
Blood cells and vessel production in structures outside the embryo proper called the yolk sac, chorion, and connecting stalk begin about 15 to 16 days following fertilization.
From Textbooks ● Jun. 19, 2013
The bones seemed better developed than ordinarily; the skin was thick, callous, and yellowish The chorion, amnion, and placenta were ossified and the cord dried up.
From Anomalies and Curiosities of Medicine by Pyle, Walter L. (Walter Lytle)
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
