n.1.(Chem.) A crystalline, nitrogenous base, C10H14N2, isomeric with nicotine.
Webster's Revised Unabridged Dictionary, published 1913 by G. & C. Merriam Co.
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The researchers therefore decided to test the effects of a nicotine-receptor blocker rather than a nicotinic "sister" drug such as isonicotine or norisonicotine.