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Definition of quinine noun from the Oxford Advanced Learner's Dictionary

quinine

noun
 
/ˈkwɪniːn/
 
/ˈkwaɪnaɪn/
[uncountable]
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  1. a drug made from the bark of a South American tree, used in the past to treat malaria
    Word Originearly 19th cent.: from Spanish quina ‘cinchona bark’ (from Quechua kina ‘bark’) + -ine. Cinchona is an evergreen South American tree or shrub, whose bark is the source of quinine.
See quinine in the Oxford Advanced American Dictionary
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