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The Collaborative International Dictionary
Isonicotine

Isonicotine \I`so*nic"o*tine\, n. [Iso- + nicotine.] (Chem.) A crystalline, nitrogenous base, C10H14N2, isomeric with nicotine.

Wiktionary
isonicotine

n. (context organic compound English) A crystalline nitrogenous base, C10H14N2, isomeric with nicotine.