Etymology
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tachycardia (n.)

"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- "heart."

updated on May 06, 2017

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Definitions of tachycardia from WordNet

tachycardia (n.)
abnormally rapid heartbeat (over 100 beats per minute);
Etymologies are not definitions. From wordnet.princeton.edu, not affiliated with etymonline.