[Fr.] An alkaloid obtained from the bark of different species of cinchona trees, originally known in Peru, but now transplanted to Java and India. It has a bitter taste, and forms the base of certain salts used in medicine. - Sulphate of Quinine,a salt crystallizing in snow-white, light, efflorescent needles. It is not very soluble in water, but dissolves easily when a drop or two of sulphuric acid is added, and is extensively used in medicine as a tonic and febrifuge.