extrasystole

noun

ex·​tra·​sys·​to·​le ˌek-strə-ˈsi-stə-(ˌ)lē 

: a premature beat of one of the chambers of the heart that leads to momentary arrhythmia

Word History

Etymology

New Latin

First Known Use

circa 1900, in the meaning defined above

Medical Definition

extrasystole

noun

ex·​tra·​sys·​to·​le -ˈsis-tə-(ˌ)lē 

: a prematurely occurring beat of one of the chambers of the heart that leads to momentary arrhythmia but leaves the fundamental rhythm unchanged

called also premature beat

extrasystolic

-sis-ˈtäl-ik 

adjective