Meaning of “fibrillation” in the English Dictionary

british dictionary

"fibrillation" in British English

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fibrillationnoun [ U ]

uk /fɪb.rɪˈleɪ.ʃən/ us /ˌfɪb.rəˈleɪ.ʃən/ specialized

irregular, rapid contractions of muscles, especially the heart:

atrial/ventricular fibrillation

(Definition of “fibrillation” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)