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[uh-rith -mee-uh, ey-rith -] /əˈrɪð mi ə, eɪˈrɪð-/
noun, Pathology
any disturbance in the rhythm of the heartbeat.
Also, arhythmia.
1885-90; < New Latin < Greek arrhythmía. See a-6, rhythm, -ia
Related forms
[uh-rith -mik, ey-rith -] /əˈrɪð mɪk, eɪˈrɪð-/ (Show IPA),
arrhythmical, adjective
arrhythmically, adverb
Can be confused
arrhythmic, eurhythmic. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for arrhythmical


any variation from the normal rhythm in the heartbeat
Word Origin
C19: New Latin, from Greek arrhuthmia, from a-1 + rhuthmosrhythm
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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arrhythmical in Medicine

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

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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arrhythmical in Science
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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