quinine

n. Bitter drug obtained from cinchona bark, used as a tonic and to reduce fever. [spanish quina cinchona bark, from quechua kina bark]

n. 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.