n. [ From T. Allan, who first distinguished it as a species. ] (min.) A silicate containing a large amount of cerium. It is usually black in color, opaque, and is related to epidote in form and composition. [ 1913 Webster ]
a. [ Cf. F. allantoïque. ] Pertaining to, or contained in, the allantois. [ 1913 Webster ]
Allantoic acid. (Chem.)
‖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 ]