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arrhythmia
arrhythmia [ ə rími ə, ay rími ə ]


noun 
Definition:
 
irregular heartbeat: an irregularity in a rhythmic action such as a heartbeat or breathing
[Late 19th century. < Greek< arruthmos 'without measure' < rhuthmos (see rhythm)]
Encarta® World English Dictionary [World English Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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