quinine

[kwahy-nahyn, kwin-ahyn or, esp. British, kwi-neen]
noun Chemistry, Pharmacology.
1.
a white, bitter, slightly water-soluble alkaloid, C 2 0 H 2 4 N 2 O 2 , having needlelike crystals, obtained from cinchona bark: used in medicine chiefly in the treatment of resistant forms of malaria.
2.
a salt of this alkaloid, especially the sulfate.

Origin:
1820–30; < Spanish quin(a) (< Quechua kina bark) + -ine2

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World English Dictionary
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
 
[C19: from Spanish quina cinchona bark, from Quechua kina bark]

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

quinine
1826, from Sp. quina "cinchona bark" (from which it is extracted), from Quechua (Peru) kina.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

quinine qui·nine (kwī'nīn')
n.

  1. A bitter colorless amorphous powder or crystalline alkaloid derived from certain cinchona barks and used to treat malaria.

  2. Any of various compounds or salts of quinine.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
quinine   (kwī'nīn')  Pronunciation Key 
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. See Note at aspirin.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Evidence of quinoline, which contains quinine, is a bit more difficult to
  explain.
There was quinine in the tonic, so that's how they justified the drinking.
For centuries, the standard treatment was quinine, and then the chemically
  related compound chloroquine.
Various things were popularly suggested to take the place of quinine and other
  medicines.
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