n. [ Quinoline + hydrazine. ] (Chem.) any one of a series of nitrogenous bases, certain of which are used as antipyretics. [ 1913 Webster ]

n. (Chem.) An alkaloid isomeric with, and resembling, quinine, found in certain species of cinchona, from which it is extracted as a bitter white crystalline substance; conchinine. It is used somewhat as a febrifuge. [ Written also chinidine. ] [ 1913 Webster ]