a white, crystalline, slightly water-soluble, levorotatory alkaloid, C19H22N2O, stereoisomeric with cinchonine and similarly derived, used chiefly as a quinine substitute.
Main Entry: cin·cho·ni·dine Pronunciation: -'kän-&-"dEn, -'kO-n&-, -'chO-n&- Function: noun : a bitter crystallinealkaloid C19H22N2O stereoisomeric with cinchonine that is found in cinchona bark and used like quinine
[sing-kon-i-deen, -din, sin-] 
ɪˌdin