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From The Collaborative International Dictionary of English v.0.48:
Quinidine \Quin"i*dine\, n. (Chem.) 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. [Written also chinidine.] [1913 Webster]