Dictionary
ar•rhyth•mi•a
Pronunciation: (u-ri&thslash;'mē-u, ā-ri&thslash;'-), [key]—
n. Pathol.
any disturbance in the rhythm of the heartbeat.
Also,arhythmia.Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.