A compound containing a benzene ring in which two of the carbon atoms have been replaced by nitrogen atoms, especially any of three isomers having the composition C4H4N2.

• 二嗪一种含有一个苯环，其中两个碳原子被氮原子取代，尤其是有这种组成的C4H4N2的三种同分异构体的任一个