(n) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals)
{ ‖ } 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 ]
‖n. pl. [ NL. ] (Zool.) The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals. [ 1913 Webster ]
n. (Chem.) A crystalline, transparent, colorless substance found in the allantoic liquid of the fetal calf; -- formerly called allantoic acid and amniotic acid. [ 1913 Webster ]
‖n. pl. [ Gr. 'an priv. + E. allantoidea. ] (Zool.) The division of Vertebrata in which no allantois is developed. It includes amphibians, fishes, and lower forms. [ 1913 Webster ]
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