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

Historical Examples of countershock

  • Among them is the shock which cuts off the past and the countershock which reawakens memory.