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单词 extraembryonic membrane
释义

WordReference Random House Unabridged Dictionary of American English © 2024
extraembryonic membrane, [Embryol.]
  1. Developmental Biologyany of the tissues, derived from the fertilized egg, that enclose or otherwise contribute to the support of the developing embryo, as the yolk sac, allantois, amnion, and chorion. Also called embryonic membrane. 

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