a colorless, crystalline, slightly water-soluble alkaloid, C19H22N2O, a stereoisomer of cinchonidine, obtained from the bark of various species of cinchona and used chiefly as a quinine substitute.
Main Entry: cin·cho·nine Pronunciation: 'si[ng]-k&-"nEn, 'sin-ch&- Function: noun : a bitter white crystalline alkaloidC19H22N2O found especially in cinchona bark and used like quinine