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1. (n.) quinidine
a colorless, crystalline alkaloid, isomeric with quinine, obtained from cinchona bark and used for treating malaria and arrhythmia.
Etymology: (1830–40; quin (ine ) + -idine)
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| Definition of 'quinidine' |
Princeton's WordNet |
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1. (noun) quinidine, Quinidex, Quinora
cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias
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| Definition of 'quinidine' |
Webster Dictionary |
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1. (noun) quinidine
an alkaloid isomeric with, and resembling, quinine, found in certain species of cinchona, from which it is extracted as a bitter white crystalline substance; conchinine. It is used somewhat as a febrifuge
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| Definition of 'quinidine' |
U.S. National Library of Medicine |
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1. quinidine
An optical isomer of quinine, extracted from the bark of the Cinchona tree and similar plant species. This alkaloid dampens the excitability of cardiac and skeletal muscles by blocking sodium and potassium currents across cellular membranes. It prolongs cellular action potential, and decreases automaticity. Quinidine also blocks muscarinic and alpha-adrenergic neurotransmission.
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Definitions of quinidine 
