[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
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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.

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
Originating within the heart itself, unrelated to brain signals or emotional distress, these arrhythmias can disrupt blood flow.
Doctors now prescribe more judiciously, though treatment still saves lives in the case of severe arrhythmias.
Although the causes of such events are not fully known, heart arrhythmias may be a factor in many cases.
High doses may also cause dangerous heart arrhythmias.
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