quinine

UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/kwɪˈniːn/

US:USA pronunciation: IPAUSA pronunciation: IPA/ˈkwaɪnaɪn, ˈkwɪnaɪn/

US:USA pronunciation: respellingUSA pronunciation: respelling(kwī′nīn, kwin′īn or, esp. Brit., kwi nēn′)

qui•nine /ˈkwaɪnaɪn, ˈkwɪnaɪn/USA pronunciation n. [uncountable]

Drugsa white crystal-like substance from the bark of certain trees, used for treating malaria.

qui•nine (kwī′nīn, kwin′īn or, esp. Brit., kwi nēn′),USA pronunciation n. [Chem., Pharm.]

Chemistry, Drugsa white, bitter, slightly water-soluble alkaloid, C₂₀H₂₄N₂O₂, having needlelike crystals, obtained from cinchona bark: used in medicine chiefly in the treatment of resistant forms of malaria.
Chemistrya salt of this alkaloid, esp. the sulfate.

Collins Concise English Dictionary © HarperCollins Publishers::

quinine /kwɪˈniːn; US: ˈkwaɪnaɪn/ n

a bitter crystalline alkaloid extracted from cinchona bark, the salts of which are used as a tonic, antipyretic, analgesic, etc, and in malaria therapy. Formula: C₂₀H₂₄N₂O₂

Etymology: 19th Century: from Spanish quina cinchona bark, from Quechua kina bark

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