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From The Collaborative International Dictionary of English v.0.48:
Quinoline \Quin"o*line\, n. [Quinine + L. oleum oil + -ine.] (Chem.) 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.] [1913 Webster]