[ kwin-i-deen, -din ]
/ ˈkwɪn ɪˌdin, -dɪn /

noun Pharmacology.

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.

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. 2020

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British Dictionary definitions for quinidine

/ (ˈkwɪnɪˌdiːn) /


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
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

Medical definitions for quinidine

[ kwĭnĭ-dēn′ ]


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