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Definitions of allantois
  1. noun
    the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)
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Definition that contains allantois
  • chorioallantoic membrane the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
  • allantoic relating to or characterized by an allantois
  • chorioallantois the very vascular fetal membrane composed of the fused chorion and adjacent wall of the allantois
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