cinchona (sin-ko´na)

The dried bark of the root and stem of various species of Cinchona, a genus of evergreen trees (family Rubiaceae), native of South America but cultivated in various tropical regions. The cultivated bark contains 7 to 10% of total alkaloids; about 70% is quinine. C. contains more than 20 alkaloids, of which two pairs of isomers are most important: quinine and quinidine, and cinchonidine and cinchonine.bark (2) , cinchona bark, Jesuits' bark, Peruvian bark, quina, quinaquina, quinquina; [Cinchona, fr. Countess of Chinch´on]


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