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a. (Chem.) Pertaining to, or designating, an aldehyde acid, intermediate between glycol and oxalic acid. [ Written also glyoxylic. ] [ 1913 Webster ]

n. (Chem.) A white, crystalline, organic base, C3H4N2, produced by the action of ammonia on glyoxal, and forming the origin of a large class of derivatives hence, any one of the series of which glyoxaline is a type; -- called also oxaline. [ 1913 Webster ]

n. [ Glyoxal + oxime. ] (Chem.) A white, crystalline, nitrogenous substance, produced by the action of hydroxylamine on glyoxal, and belonging to the class of oximes; also, any one of a group of substances resembling glyoxime proper, and of which it is a type. See Oxime. [ 1913 Webster ]

n. [ Gr. &unr_; pus + &unr_; yellow. ] (Physiol. Chem.) A greenish yellow crystalline coloring matter found with pyocyanin in pus. [ 1913 Webster ]