noun Pathology.

a premature contraction of the heart, resulting in momentary interruption of the normal heartbeat.

Origin of extrasystole

From New Latin, dating back to 1895–1900; see origin at extra-, systole
Also called premature beat, premature contraction.
Related formsex·tra·sys·tol·ic [ek-struh-sis-tol-ik] /ˌɛk strə sɪsˈtɒl ɪk/, adjective
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for extrasystole

Historical Examples of extrasystole

extrasystole in Medicine




An ectopic, usually premature contraction of one of the chambers of the heart, resulting in momentary cardiac arrhythmia.premature systole
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.