Definition of "ventricular fibrillation" []

• An often fatal form of arrhythmia characterized by rapid, irregular fibrillar twitching of the ventricles of the heart in place of normal contractions, resulting in a loss of pulse. (noun)

American Heritage(R) Dictionary of the English Language, Fifth Edition. Copyright (c) 2011 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.