nicotidine

from The Century Dictionary.

• noun A pale-yellow poisonous thick oil, C₁₀H₁₄N₂, prepared by the action of zinc or concentrated hydrochloric acid on metadipyridyl. It boils at 287–289° C., has a strongly narcotic odor, and is found in bone-oil. Also called 3- or meta-hexahydrodipyridyl.

from the GNU version of the Collaborative International Dictionary of English.

• noun (Chem.) A complex, oily, nitrogenous base, isomeric with nicotine, and obtained by the reduction of certain derivatives of the pyridine group.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun chemistry A complex, oily, nitrogenous base, isomeric with nicotine, obtained by the reduction of certain derivatives of the pyridine group.