fibrillation

[fahy-bruh-ley-shuh n, or especially for 2, fib-ruh-]

noun

the formation of fibrils.
Pathology. uncontrolled twitching or quivering of muscular fibrils.

Origin of fibrillation

First recorded in 1830–40; fibrillate + -ion

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for fibrillation

Historical Examples of fibrillation

Even in periods of repose there is a certain amount of fibrillation on that side.
Tics and Their Treatment
Henry Meigne
The common type of lesion is a dry arthritis with fibrillation and eburnation of the articular surfaces.
Manual of Surgery Volume Second: Extremities--Head--Neck. Sixth Edition.
Alexander Miles
The myokymia of Kny and Schultze is characterised by fibrillation, pain, hyperidrosis, and changes in electrical excitability.
Tics and Their Treatment
Henry Meigne
This fibrillation of mucus is regarded as the result of a coagulation of its mucin, previously held in solution by an alkali.
A System of Practical Medicine by American Authors, Vol. I
Various

British Dictionary definitions for fibrillation

fibrillation

noun

a local and uncontrollable twitching of muscle fibres, esp of the heart, not affecting the entire muscle. Atrial fibrillation results in rapid and irregular heart and pulse rate. In ventricular fibrillation, the heart stops beating
irregular twitchings of the muscular wall of the heart, often interfering with the normal rhythmic contractions

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

Word Origin and History for fibrillation

c.1840, noun of action from fibrillate.

fibrillation in Medicine

fibrillation

[fĭb′rə-lā′shən, fī′brə-]

Fine, rapid twitching of individual muscle fibers with little or no movement of the muscle as a whole.
The formation of fibrils.
Vermicular twitching, usually slow, of individual muscular fibers, commonly occurring in the atria or ventricles of the heart and in recently denervated skeletal muscle fibers.

fibrillation in Science

fibrillation

[fĭb′rə-lā′shən]

A rapid twitching of muscle fibers, as of the heart, that is caused by the abnormal discharge of electrical nerve impulses. Ventricular fibrillation is life-threatening.