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noun
The outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals).
is a specific kind of: sac.
has as a part: chorionic villus.
is a part of: amniote | fetal membrane.
domain category: mammal, mammalian.
derivation: chorionic.
Dutch: chorion, vaatvliesPolish: kosmówka
Find more on chorion elsewhere: etymology - rhymes - Wikipedia.
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