di·a·zine | \ ˈdī-ə-ˌzēn 
, dī-ˈaz-ᵊn \
, dī-ˈaz-ᵊn \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
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