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1. Oxford Dictionary

   chorion

   • IPA[ˈkɔːrɪən]

   英式

   • n.
     the outermost membrane surrounding an embryo of a reptile, bird, or mammal. In mammals it contributes to the formation of the placenta.

   • noun: chorion, plural noun: chorions

2. • 更多解釋

   chorion

   • IPA[ˈkôrēˌän]

   美式

   • n.
     the outermost membrane surrounding an embryo of a reptile, bird, or mammal. In mammals ...

   Oxford American Dictionary