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fibrillation

/ˌfɪbɹɪˈleɪʃən/ noun C2
  1. The rapid, irregular, and unsynchronized contraction of the muscle fibers of the heart. (countable, uncountable)

Plural fibrillations

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Words, meanings, pronunciations and translations from Wiktionary (CC BY-SA 4.0); how common each word is from wordfreq. Made into this dictionary by FluentPlex.