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English definition of “haemifacial spasm”

haemifacial spasm

noun [C] uk specialized (US hemifacial spasm)   /hiː.mɪˌfeɪ.ʃəl ˈspæz.əm/ us    /ˈhiː.məˌfeɪ.ʃəl ˈspæz.əm/
a spasm (= occasion when a muscle suddenly becomes tighter) affecting one side of the face: Hemifacial spasms are caused by a blood vessel pressing on one of the nerves coming from the brain.
(Definition of haemifacial spasm from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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