cinchona

Short definition from Wiktionary

Noun

1. 1
   A tree or shrub of the genus Cinchona, native to the Andes in South America but since widely cultivated in Indonesia and India as well for its medicinal bark.
2. 2
   The bark of these plants, which yield quinine and other alkaloids useful in reducing fevers and particularly in combatting malaria.
3. 3
   Any medicine chiefly composed of the prepared bark of these plants.