单词	chorion
释义	chorion noun cho·​ri·​on ˈkȯr-ē-ˌän  : the highly vascular outer embryonic membrane of reptiles, birds, and mammals that in placental mammals is associated with the allantois in the formation of the placenta Example Sentences Recent Examples on the Web This is essentially a blood clot that can occur when the outermost membrane surrounding the embryo (the chorion) separates a little from the uterine wall, allowing some blood to pool in that space between the two. Amy Marturana, SELF, 28 Dec. 2018 Word History Etymology New Latin, from Greek, afterbirth First Known Use 1545, in the meaning defined above Medical Definition chorion noun cho·​ri·​on ˈkōr-ē-ˌän, ˈkȯr-  : the highly vascular outer embryonic membrane that is associated with the allantois in the formation of the placenta
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