Webster’s Revised Unabridged Dictionary · 1913
Picoline
Pic′o·line (pĭk′ō·lĭn or ·lēn), 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.