countershock

noun
coun·​ter·​shock | \ -ˌshäk How to pronounce countershock (audio) \

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

Learn More about countershock

Cite this Entry

“Countershock.” Merriam-Webster.com Medical Dictionary, Merriam-Webster, https://www.merriam-webster.com/medical/countershock. Accessed 11 Jul. 2020.

Comments on countershock

What made you want to look up countershock? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

See Definitions and Examples »

Get Word of the Day daily email!

Test Your Vocabulary

Words for Summer: A Quiz

  • a closeup of a sunflower
  • Which of the following words means “of or relating to summer”?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!