noun\ˈkwī-ˌnīn alsoˈkwin-ˌīn, especially British kwin-ˈēn, ˈkwin-ēn\(Medical Dictionary)
Medical Definition of QUININE
: a bitter crystalline alkaloid C20H24N2O2 obtained from cinchona bark that is used as a flavoring agent, has antipyretic and analgesic properties, and is administered orally in the form of its salts (as the hydrated sulfate (C20H24N2O2)2·H2SO4·2H2O) as an antimalarial
Alkaloid found in the bark of cinchona trees and shrubs. The chemical structure of this heterocyclic compound is large and complex, with several rings. For the 300 years preceding the 1940s, when newer antimalarials were developed, quinine was the only drug known to Western medicine for the prevention and treatment of malaria. The first chemical compound ever used successfully against an infectious disease, it has benefited more people than any other such drug in history and is still used to treat malaria, often in combination with other drugs. Quinine is also a flavouring agent in some carbonated beverages, including tonic water.