What is "triazine"

n. (context organic compound English) Any of three isomeric aromatic heterocycles containing three carbon atoms, three nitrogen atoms and three double bonds

n. any of three isomeric compounds having three carbon and three nitrogen atoms in a six-membered ring

A triazine is class of nitrogen-containing heterocycles. The parent molecules' molecular formula is . They exist in three isomeric forms, 1,3,5-triazines being common.