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The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.

[Greek khorion; see gherə- in Indo-European roots.]

cho′ri·on′ic (-ŏn′ĭk) adj.
ThesaurusAntonymsRelated WordsSynonymsLegend:
Adj.1.chorionic - of or relating to a chorion; "a chorionic villus is a minute vascular projection on the fetal chorion"
References in periodicals archive ?
The first involves transferring cloned embryos made of identical genetic material into mares of different breeds and ages in order to better understand the development of a part of the placenta, called the chorionic girdle, that develops uniquely in horses.

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