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nounthe vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)type of:
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