Diureide :: Diureide (n.) 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..

Monureid :: Monureid (n.) Any one of a series of complex nitrogenous substances regarded as derived from one molecule of urea; as, alloxan is a monureid..

Ureide :: Ureide (n.) Any one of the many complex derivatives of urea; thus, hydantoin, and, in an extended dense, guanidine, caffeine, et., are ureides..

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