Etymology
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chorion (n.)

"outer membrane of the fetus," 1540s, medical Latin, from Greek khorion "membrane enclosing the fetus, afterbirth," from PIE root *ghere- "gut, entrail." Related: Chorionic.

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Definitions of chorion

chorion (n.)
the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals);
From wordnet.princeton.edu