Definitions for quinidineˈkwɪn ɪˌdin, -dɪn
Random House Webster's College Dictionary
quin•i•dineˈkwɪn ɪˌdin, -dɪn(n.)
a colorless, crystalline alkaloid, isomeric with quinine, obtained from cinchona bark and used for treating malaria and arrhythmia.
Origin of quinidine:
1830–40; quin (ine ) + -idine
quinidine, Quinidex, Quinora(noun)
cardiac drug (trade names Quinidex and Quinora) used to treat certain heart arrhythmias
An isomer of quinine that is used as an antiarrhythmic agent
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
U.S. National Library of Medicine
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.