- An electric shock that is applied to the chest to restore normal rhythm of the heart.
The American Heritage® Stedman's Medical Dictionary Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
Examples from the Web for countershock
Among them is the shock which cuts off the past and the countershock which reawakens memory.The Million Dollar Mystery