QUINOLINE

Noun

quinoline (plural quinolines)

(organic compound) Any of a class of aromatic heterocyclic compounds containing a benzene ring fused with a pyridine ring; especially the simplest such compound, C₉H₇N.

Source: Wiktionary

Quin"o*line, n. Etym: [Quinine + L. oleum oil + -ine.] (Chem.)

Definition: A nitrogenous base, C9H7N obtained as a pungent colorless liquid by the distillation of alkaloids, bones, coal tar, etc. It the nucleus of many organic bodies, especially of certain alkaloids and related substances; hence, by extension, any one of the series of alkaloidal bases of which quinoline proper is the type. [Written also chinoline.]

Source: Webster’s Unabridged Dictionary 1913 Edition