ˈkäləˌdēn, -_də̇n noun
( -s )
Etymology: International Scientific Vocabulary coll- + -idine
: any of a number of organic bases C 8 H 11 N that are the trimethyl, methyl-ethyl, and propyl homologues of pyridine, that are in general pungent oily poisonous liquids, and are obtained chiefly as by-products in the coking process or are synthesized: as
a. : the liquid symmetrical trimethyl homolog made by reaction of acetone and ammonia and used as a solvent in chromatography — called also s-collidine, 2,4,6-collidine, 2,4,6-trimethylpyridine
b. : methylethylpyridine