Quinine meaning

kwī'nīn'
A bitter, colorless, amorphous powder or crystalline alkaloid, C20 H24 N2 O2 · 3H2 O, derived from certain cinchona barks and used in medicine to treat malaria.
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Any of various compounds or salts of quinine.
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A bitter, crystalline alkaloid, C20H24N2O2, extracted from cinchona bark.
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Any compound of this, as quinine sulfate, used in medicine for various purposes, esp. for treating malaria.
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A bitter alkaloid, C20 H24 N2 O2 , derived from the bark of several species of cinchona, used usually in the form of its sulfate salt to treat malaria and formerly to treat leg cramps. It is used in the form of its hydrochloride or sulfate salt as a flavoring, especially in tonic water.
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A bitter-tasting, colorless drug derived from the bark of certain cinchona trees and used medicinally to treat malaria. For hundreds of years quinine was the only drug known to effectively combat malarial infection. It has since been largely replaced by synthetic compounds that not only relieve the symptoms of malaria but also rid the body of the malarial parasite, which quinine does not do.
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(pharmacology) A bitter colourless powder, an alkaloid derived from cinchona bark, used to treat malaria and as an ingredient of tonic water.
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Origin of quinine

From Spanish quina (“cinchona bark"), from Quechua kina.