trigeminal rhythm n. A cardiac dysrhythmia in which heartbeats occur in groups of threes, usually composed of a sinus beat followed by two extrasystolic beats.trigeminy Liberaldictionary.com
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The American Heritage® Stedman’s Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.