Medical Dictionary
countershock
noun coun·ter·shock \-ˌshäk\
Medical Definition of COUNTERSHOCK
: a therapeutic shock of electricity applied to a heart for the purpose of altering a disturbed rhythm (as in chronic atrial fibrillation) <delivering a life-saving countershock within seconds of an arrhythmic episode—John Maurice>
Seen & Heard
What made you want to look up countershock? Please tell us where you read or heard it (including the quote, if possible).