quinine

A bitter, colorless, amorphous powder or crystalline alkaloid, C₂₀H₂₄N₂O₂·3H₂O, derived from certain cinchona barks and used in medicine to treat malaria.

Any of various compounds or salts of quinine.

A very important vegetable alkali (C₂₀H₂₄N₂O₂), obtained from the bark of several trees of the genus Cinchona.

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.

A bitter colourless powder, an alkaloid derived from cinchona bark, used to treat malaria and as an ingredient of tonic water.

a bitter alkaloid extracted from chinchona bark; used in malaria therapy