n. [ Cf. F. amidine, fr. amido&unr_; starch, fr. L. amylum, Gr. &unr_; fine meal, neut. of &unr_; not ground at the mill, -- hence, of the finest meal;
n. [ Oxygen + amido + -ine. ] (Chem.) One of a series of bases containing the amido and the isonitroso groups united to the same carbon atom. [ 1913 Webster ]