%picoline%

n. [ L. pix, picis, pitch + oleum oil + -ine. ] (Chem.) Any one of three isometric bases (C6H7N) related to pyridine, and obtained from bone oil, acrolein ammonia, and coal-tar naphtha, as colorless mobile liquids of strong odor; -- called also methyl pyridine. [ 1913 Webster ]