Source : Webster's Revised Unabridged Dictionary (1913)

Cinchona \Cin*cho"na\, n. [So named from the wife of Count
   Chinchon, viceroy of Peru in the seventeenth century, who by
   its use was freed from an intermittent fever, and after her
   return to Spain, contributed to the general propagation of
   this remedy.]
   1. (Bot.) A genus of trees growing naturally on the Andes in
      Peru and adjacent countries, but now cultivated in the
      East Indies, producing a medicinal bark of great value.

   2. (Med.) The bark of any species of {Cinchona} containing
      three per cent. or more of bitter febrifuge alkaloids;
      Peruvian bark; Jesuits' bark.

Source : WordNet®

cinchona
     n : any of several trees of the genus Cinchona [syn: {chinchona}]