tachycardia (n.)youdaoicibaDictYouDict[tachycardia 词源字典]
"rapid heartbeat," 1868, Modern Latin, coined 1867 by German-born physician Hermann Lebert (1813-1878) from tachy- "swift" + Latinized form of Greek kardia "heart," from PIE root *kerd- (1) "heart" (see heart (n.)).[tachycardia etymology, tachycardia origin, 英语词源]