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English definition of “anaesthetic”

anaesthetic

noun [U or C] uk mainly US (US usually anesthetic)   /ˌæn.əsˈθet.ɪk/ us    /-ˈθet̬-/
a substance that makes you unable to feel pain: The operation is performed under anaesthetic. The procedure is carried out under local anaesthetic (= a substance that makes you unable to feel pain in part of your body). I've never had a general anaesthetic (= a substance that makes you unconscious so you do not feel pain).
(Definition of anaesthetic from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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