chorion - Dictionary definition and pronunciation - Yahoo! Education
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cho·ri·on  audio  (kôr-n, kr-) KEY 

NOUN:
The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.
ETYMOLOGY:
Greek khorion; see gher- in Indo-European roots

OTHER FORMS:
chori·onic  (-nk) KEY (Adjective)


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