chorionic

cho·ri·on

 (kôr′ē-ŏn′)

n.

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

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

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cho′ri·on′ic (-ŏn′ĭk) adj.

Thesaurus

Adj.

1.

chorionic - of or relating to a chorion; "a chorionic villus is a minute vascular projection on the fetal chorion"