ureide

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun Any of various derivatives of urea.

from The Century Dictionary.

• noun A compound of urea with an acid radical. The ureides include a large number of urea-derivatives of very complex structure.

from the GNU version of the Collaborative International Dictionary of English.

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

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry any compound, of general formula R-CO-NH-CO-NH2 or R-CO-NH-CO-NH-CO-R', formally derived by the acylation of urea