n. [ Di- + ureide. ] (Chem.) One of a series of complex nitrogenous substances regarded as containing two molecules of urea or their radicals, as uric acid or allantoin. Cf. Ureide. [ 1913 Webster ]
n. (Chem.) Any one of the many complex derivatives of urea; thus, hydantoin, and, in an extended dense, guanidine, caffeine, et., are ureides.