The Collaborative International Dictionary of English v.0.48:

Collidine \Col"li*dine\, n. [Gr. ko`lla glue.] (Chem.)
   One of a class of organic bases, C8H11N, usually pungent
   oily liquids, belonging to the pyridine series, and obtained
   from bone oil, coal tar, naphtha, and certain alkaloids.
   [1913 Webster]