Usually means: Rapid, uncoordinated contractions of fibers.
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We found 9 dictionaries that define the word fibrillating:

General (6 matching dictionaries)
  1. fibrillating: Merriam-Webster
  2. fibrillating: Vocabulary.com
  3. fibrillating: Wordnik
  4. fibrillating: Wiktionary
  5. fibrillating: Dictionary.com
  6. fibrillating: TheFreeDictionary.com

Computing (1 matching dictionary)
  1. fibrillating: Encyclopedia

Medicine (2 matching dictionaries)
  1. fibrillating: Merriam-Webster Medical Dictionary
  2. fibrillating: Medical dictionary

(Note: See fibrillate as well.)

Definitions from Wiktionary (fibrillating)

adjective:  Splitting into fibrils or fibres.
adjective:  Of a muscle, especially in the heart: undergoing fibrillation; quivering.

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