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 + -ine. ] (Chem.) See Glyoxaline. [ 1913 Webster ]

n. [ Quinoline + glyoxal. ] (Chem.) Any one of a series of complex nitrogenous bases obtained by the union of certain aniline derivatives with glyoxal or with certain ketones. [ Written also chinoxaline. ] [ 1913 Webster ]