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allorhythmia

(ăl′ō-rĭðmē-ə)
n.
  1. An irregularity in the rhythm of the heartbeat or pulse that recurs in a regular fashion.
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Related formsal′lo•rhythmic (-mĭk) adj.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.