diazine

noun Chemistry.

1. any of three isomeric compounds having the formula C4H4N2, containing a ring of four carbon atoms and two nitrogen atoms.

noun

1. 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 C 4 N 2 H 4See also pyrimidine

n.

1. A compound containing a benzene ring in which two of the carbon atoms have been replaced by nitrogen atoms.