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allantois n. 尿膜 尿膜 allantois n 1: the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) Allantois \Al*lan"to*is\, Allantoid \Al*lan"toid\, ] n.. (Anat.)
A membranous appendage of the embryos of mammals, birds, and reptiles, -- in mammals serving to connect the fetus with the parent; the urinary vesicle. [1913 Webster]
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