[az-een, -in, ey-zeen, ey-zin] 
| any of a group of six-membered heterocyclic compounds containing one or more nitrogen atoms in the ring, the number of nitrogen atoms present being indicated by a prefix, as in diazine or triazine. |
| az·ine (āz'ēn', ā'zēn') n. A six-membered heterocyclic compound, such as pyridine, that contains one or more atoms of nitrogen with a ring structure resembling that of benzene. |
in
