extrasystole

[ek-struh-sis-tuh-lee]

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. 2018

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extrasystole in Medicine

extrasystole

[ĕk′strə-sĭstə-lē]
n.
  1. 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.