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arrhythmia
ar·rhyth·mi·a [ ə rímee ə, ay rímee ə ]


noun 
Definition:
 
irregular heartbeat: an irregularity in the rhythm of the heartbeat
[Late 19th century. < Greek< arruthmos "without measure" < rhuthmos (see rhythm)]
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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