- any of several trees or shrubs of the genus Cinchona, of the madder family, especially C. calisaya, native to the Andes, cultivated there and in Java and India for its bark, which yields quinine and other alkaloids.
- the medicinal bark of such trees or shrubs.
- any tree or shrub of the South American rubiaceous genus Cinchona, esp C. calisaya, having medicinal bark
- the dried bark of any of these trees, which yields quinine and other medicinal alkaloids
- any of the drugs derived from cinchona bark
