Yours, Etc.: Origins and Uses of 8 Sign-Offs
1868, Modern Latin, coined 1867 by German-born physician Hermann Lebert (1813-1878) from tachy- "swift" + kardia "heart" (see cardiac).
tachycardia tach·y·car·di·a (tāk'ĭ-kär'dē-ə)n. A rapid heart rate, especially one above 100 beats per minute in an adult. Also called tachyrhythmia.