| allantoic | (adj) relating to or characterized by an allantois |
| allantoid | (adj) shaped like a sausage, Syn. sausage-shaped |
| allantois | (n) the vascular fetal membrane that lies below the chorion and develops from the hindgut in many embryonic higher vertebrates (reptiles, birds and mammals) |
| Allantoic | a. [ Cf. F. allantoïque. ] Pertaining to, or contained in, the allantois. [ 1913 Webster ]
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| Allantoid | |
| Allantoidal | |
| Allantoidea | ‖n. pl. [ NL. ] (Zool.) The division of Vertebrata in which the embryo develops an allantois. It includes reptiles, birds, and mammals. [ 1913 Webster ] |
| Allantoin | 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 ] |
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