a. [ See Quinine, and cf. Kinic. ] (Chem.) Pertaining to, derived from, or connected with, quinine and related compounds; specifically, designating a nonnitrogenous acid obtained from cinchona bark, coffee, beans, etc., as a white crystalline substance.
n. (Chem.) An uncrystallizable alkaloid obtained by the action of heat from quinine, with which it is isomeric. [ 1913 Webster ]