• synonyms


[kwin-i-deen, -din]
noun Pharmacology.
  1. a colorless, crystalline alkaloid, C20H24N2O2, isomeric with quinine, obtained from the bark of certain species of cinchona trees or shrubs, used chiefly to regulate heart rhythm and to treat malaria.
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Origin of quinidine

First recorded in 1830–40; quin(ine) + -id3 + -ine2
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for quinidine

Historical Examples of quinidine

  • Quinidine yields with chromic acid the same decomposition products as quinine.

    Scientific American Supplement, No. 415, December 15, 1883


  • This reaction is not characteristic of quinine, for with quinidine one gets the same reaction.

  • Dr de Vrij, for instance, found sometimes more than 20% of quinidine in some samples of quinoidine of commerce.

  • From the above statement respecting the solubility of quinidine in ether, it appears that the 10 gr.

  • If this be quinidine, it will be dissolved on the addition of proportionately more ether, while cinchonine will remain unaffected.

British Dictionary definitions for quinidine


  1. a crystalline alkaloid drug that is an optically active diastereoisomer of quinine: used to treat heart arrhythmias. Formula: C 20 H 24 N 2 O 2
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

quinidine in Medicine


  1. A colorless crystalline alkaloid that is a stereoisomer of quinine and is used as a treatment for malaria and cardiac arrhythmias.
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The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.