Definitions

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. A bicyclic heterocycle consisting of a benzene ring fused to pyridazine

from The Century Dictionary and Cyclopedia

  • n. A crystalline base, C8H6N2, made by boiling phthalic aldehyde with an aqueous solution of hydrazine. It melts at 90–91° C.

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