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


  1. 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
  2. irregular twitchings of the muscular wall of the heart, often interfering with the normal rhythmic contractions

c.1840, noun of action from fibrillate.


  1. Fine, rapid twitching of individual muscle fibers with little or no movement of the muscle as a whole.
  2. The formation of fibrils.
  3. 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.

  1. 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.

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