Webster's English Dictionary

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cinchona

cin.cho.na \sin-'ko--n*, sin-'cho--\ \sin-'ka:n-ik, sin-'cha:n-\ n [NL, 
   genus name, fr. the countess of Chincho'n -1641 wife of the Per]uvian 
   viceroy 1: any of a genus (Cinchona) of So. American trees and shrubs of 
   the  madder family 2: the dried bark of a cinchona (as C. legeriana) 
   containing al kaloids (as quinine) and used as a specific in malaria - 
   cin.chon.ic aj