Source : Webster's Revised Unabridged Dictionary (1913)

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}.]