chorion Meaning, Definition & Usage
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noun the outermost membranous sac enclosing the embryo in higher vertebrates (reptiles, birds and mammals)
WordNet
Cho"ri*on noun
Etymology
NL., fr. Gr. .Definitions
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(Anat.) (a) The outer membrane which invests the fetus in the womb; also, the similar membrane investing many ova at certain stages of development. (b) The true skin, or cutis. -
(Bot.) The outer membrane of seeds of plants.