SINCE 1828
diazine
noun
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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Merriam-Webster unabridged
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