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单词 chorion
释义
cho·ri·on (kôrē-ŏn)
n.
The outer membrane enclosing the embryo in reptiles, birds, and mammals. In placental mammals it contributes to the development of the placenta.

[Greek khorion; see gherə- in the Appendix of Indo-European roots.]

chori·onic (-ŏnĭk) adj.
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