n. (Physiol. Chem.) A nonoxygenous ptomaine, formed in the putrefaction of albuminous matters, especially of horseflesh and mackerel. [ 1913 Webster ]

n. (Chem.) A liquid base, C9H13N, of the pyridine group, found in coal tar; also, any one of the series of isomeric substances of which it is the type. [ 1913 Webster ]