[dahy-uh-zeen, -zin, dahy-az-een, -in]
noun Chemistry.
any of three isomeric compounds having the formula C 4 H 4 N 2 , containing a ring of four carbon atoms and two nitrogen atoms.

diaz- + -ine2

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World English Dictionary
diazine or diazin (ˈdaɪəˌziːn, daɪˈæziːn, -ɪn, ˈdaɪəzɪn, daɪˈæzɪn)
See also pyrimidine any organic compound whose molecules contain a hexagonal ring of four carbon atoms and two nitrogen atoms, esp any of three isomers with the formula C4N2H4
diazin or diazin

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American Heritage
Medical Dictionary

diazine di·a·zine (dī'ə-zēn', dī-āz'ĭn)
A compound containing a benzene ring in which two of the carbon atoms have been replaced by nitrogen atoms.

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