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A compound containing a benzene ring in which two of the carbon atoms have been replaced by nitrogen atoms, especially any of three isomers having the composition C4H4N2.
diazine(ˈdaɪəˌziːn; daɪˈæziːn; -ɪn) or
(Elements & Compounds) any organic compound whose molecules contain a hexagonal ring of four carbon atoms and two nitrogen atoms, esp any of three isomers with the formula C4N2H4. See also pyrimidine