/ Dictionary / Index A arrhythmia: Meaning and Definition of Find definitions for: ar•rhyth•mi•a Pronunciation: (u-ri'mē-u, ā-ri'-), [key] — n. Pathol. any disturbance in the rhythm of the heartbeat. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arrhythmia (Thesaurus) arrhenotoky Arriaga Related Content Daily Word Quiz: belligerent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language