Quinine

·noun An alkaloid extracted from the bark of several species of cinchona (·esp. Cinchona Calisaya) as a bitter white crystalline substance, C20H24N2O2. Hence, by extension (Med.), any of the salts of this alkaloid, as the acetate, chloride, sulphate, ·etc., employed as a febrifuge or antiperiodic. Called also quinia, quinina, ·etc.