an·​ti-ar·​rhyth·​mic ˌan-tē-(ˌ)ā-ˈrit͟h-mik How to pronounce anti-arrhythmic (audio) ˌan-ˌtī- How to pronounce anti-arrhythmic (audio)
variants or antiarrhythmic
: counteracting or preventing cardiac arrhythmia
anti-arrythmic agents
antiarrhythmic noun
a calcium channel blocker commonly prescribed as an antiarrhythmic

Word History

First Known Use

1954, in the meaning defined above

Time Traveler
The first known use of anti-arrhythmic was in 1954

Dictionary Entries Near anti-arrhythmic

Cite this Entry

“Anti-arrhythmic.” Dictionary, Merriam-Webster, Accessed 2 Dec. 2023.

Medical Definition


1 of 2 adjective
an·​ti·​ar·​rhyth·​mic -(ˌ)ā-ˈrit͟h-mik How to pronounce antiarrhythmic (audio)
variants or anti-arrhythmic also antiarrhythmia or anti-arrhythmia
: controlling, inhibiting, or preventing cardiac arrhythmia
an antiarrhythmic drug
antiarrhythmic therapy


2 of 2 noun
variants also anti-arrhythmic
: an agent (as a beta-blocker or calcium channel blocker) that controls, inhibits, or prevents cardiac arrhythmia
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