allantochorion

noun
al·lan·to·cho·ri·on | \ ə-ˌlan-(ˌ)tō-ˈkōr-ē-ˌän, -ˈkȯr- \

Medical Definition of allantochorion 

: an embryonic membrane consisting of a fused allantois and chorion

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occurring twice a year or every two years

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