from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The forming of fibers.
  • n. Fine, rapid twitching of individual muscle fibers with little or no movement of the muscle as a whole.
  • n. Rapid uncoordinated twitching movements that replace the normal rhythmic contraction of the heart and may cause a lack of circulation and pulse.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The rapid, irregular, and unsynchronized contraction of the muscle fibers of the heart.

from the GNU version of the Collaborative International Dictionary of English

  • n. The state of being reduced to fibers.

from The Century Dictionary and Cyclopedia

  • n. The state of being fibrillar or fibrillated.
  • n. The formation of fibrils.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. act or process of forming fibrils
  • n. muscular twitching involving individual muscle fibers acting without coordination


from Wiktionary, Creative Commons Attribution/Share-Alike License

From New Latin fibrilla, diminutive of Latin fibra, "fiber," in reference to the muscle strands of the heart.


  • However, for larger and faster gradients applied to the thorax, induced cardiac fibrillation is a real and serious danger.

    Sir Peter Mansfield - Autobiography

  • Regulators and Sanofi-Aventis emphasized that physicians should never prescribe Multaq to patients with longer-term fibrillation.

    NYT > Home Page

  • Since I’m boring you with my afib chronicles, I should give you an update: I’m still in fibrillation but feeling much better thanks to being on a beta blocker, Toprol, which slows my heart rate and makes stairs once again no big deal.

    The Afib Chronicle « BuzzMachine

  • Ventricular fibrillation occurs when the heart's electrical circuits begin firing randomly, so the heart quivers and can't pump blood.

    Dozens of people perform CPR to save heart attack victim

  • SANJAY GUPTA, CNN CHIEF MEDICAL CORRESPONDENT: The heart condition we're talking about is atrial fibrillation, which is a relatively common problem.

    CNN Transcript Apr 29, 2008

  • That is called fibrillation, and it is fatal unless promptly treated.

    The Telltale Heart (Test)

  • A tiny clot lodging there would have sent his heart into a brief burst of the ineffectual rhythm known as fibrillation, before it stopped altogether.

    Back From the Dead

  • There is one side effect to be concerned about, and that is that it could possibly cause atrial fibrillation, which is a heart rhythm abnormality.

    CNN Transcript May 3, 2007

  • Upon further testing we're told by the vice president's office, it was determined that it was an atrial fibrillation, which is basically an abnormal rhythm involving the upper chambers of his heart.

    CNN Transcript Nov 26, 2007

  • SHAH: Well, first of all, you have to be at risk for ventricular fibrillation, which is the mechanism for sudden death.

    CNN Transcript Mar 8, 2005


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  • working with textiles made phyllis so excited, she was often in a state of fibrillation...

    November 1, 2007