[uh-rith-mee-uh, ey-rith-]
noun Pathology.
any disturbance in the rhythm of the heartbeat.
Also, arhythmia.

1885–90; < Neo-Latin < Greek arrhythmía. See a-6, rhythm, -ia

arrhythmic [uh-rith-mik, ey-rith-] , arrhythmical, adjective
arrhythmically, adverb

arrhythmic, eurhythmic. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arrhythmia (əˈrɪðmɪə)
any variation from the normal rhythm in the heartbeat
[C19: New Latin, from Greek arrhuthmia, from a-1 + rhuthmosrhythm]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

1853, "without rhythm," in relation to musical sensibility, Mod.L., from Gk. arrhythmos "irregularity," from a- "not" + rhythmos (see rhythm). Medical arrhythmia "irregularity of pulse" is attested from 1888, from Gk. noun of action from arrhythmos.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

arrhythmia ar·rhyth·mi·a (ə-rĭð'mē-ə)
An irregularity in the force or rhythm of the heartbeat.

arrhythmic ar·rhyth·mic (ə-rĭð'mĭk)
Lacking rhythm or regularity of rhythm.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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American Heritage
Science Dictionary
arrhythmia   (ə-rĭ'mē-ə)  Pronunciation Key 
An abnormal rhythm of the heart, often detectable on an electrocardiogram. Electrical impulses in the heart normally originate in the sinoatrial node of the right atrium during diastole and are transmitted through the atrioventricular node to the ventricles, causing the muscle contraction that usually occurs during systole. However, abnormalities of electrical conduction during diastole or systole can result in various alterations of the heartbeat, such as changes in heart rate, skipped or irregular beats, and fibrillation of the heart muscle, which can be life threatening. These electrical disturbances can be caused by metabolic abnormalities, inadequate blood supply (as in coronary artery disease), drug effects, chronic disease, and other factors. Arrhythmias are sometimes treated with the implantation of a pacemaker.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
Here, the distinction is not between rhythmic and arrhythmic, but between online and offline.
For years he'd been studying the phenomenon of chaos, of which an arrhythmic heartbeat was a perfect example.
However, anti-arrhythmic medications may have severe side effects.
Anti-arrhythmic drugs help control irregular heartbeats.
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