tachycardia, tachycardiac, tachycardic, tachyrhythmia An excessively rapid heartbeat, typically regarded as a heart rate exceeding 100 beats per minute in a resting adult. Found on http://www.wordinfo.info/words/index/info/view_unit/1857/3
tachyrhythmia 1. Tachycardia; an excessively or abnormally rapid heart rate. 2. Increase in the frequency of brain waves in electroencephalography up to 12 to 50 per second. Found on http://www.wordinfo.info/words/index/info/view_unit/1857/4