Relating to or suffering from excessively rapid action of the heart. ... (05 Mar 2000) ... 
Type: Term Pronunciation: tak′i-kar′dē-ak Definitions: 1. Relating to or suffering from excessively rapid action of the heart.
tachycardia, tachycardiac, tachycardic, tachyrhythmia An excessively rapid heartbeat, typically regarded as a heart rate exceeding 100 beats per minute in a resting adult.