any of a group of organic chemical compounds with a 6-membered ring containing one or more nitrogen atoms: the group consists of the diazines, triazines, etc.
See azine in American Heritage Dictionary 4
(ăzˈēnˌ, āˈzēnˌ)
noun
A six-membered heterocyclic compound, such as pyridine, that contains one or more atoms of nitrogen with a ring structure resembling that of benzene.