Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A compound containing a benzene ring in which two of the carbon atoms have been replaced by nitrogen atoms, especially any of three isomers having the composition C4H4N2.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Any six-membered aromatic heterocycle containing four carbon atoms, two nitrogen atoms and three double bonds

Etymologies

diaz(o) + -ine2.
(American Heritage® Dictionary of the English Language, Fourth Edition)

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