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chorion
cho·ri·on [ káwree òn ] (plural cho·ri·ons)


noun 
Definition:
 
outer membrane surrounding embryo: the outer membrane enclosing the embryo of mammals, reptiles, and birds. It has a dense concentration of blood vessels and aids in the formation of the placenta in mammals.
See also  amnion (sense 1)

[Mid-16th century. < Greek khorion]

cho·ri·on·ic [ kàwree ónnik ] adjective
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