Picoline \Pic"o*line\, 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]