diazine

noun
di·​a·​zine | \ ˈdī-ə-ˌzēn How to pronounce diazine (audio) , dī-ˈaz-ᵊn How to pronounce diazine (audio) \

Medical Definition of diazine

: any of three heterocyclic aromatic compounds C4H4N2 that consist of a six-membered ring and differ in the proximity of the nitrogen atoms to each other