antiknocknoun [ U ]uk /ˌæn.tiˈnɒk/ us /ˌæn.t̬iˈnɑːk/
adjective [ before noun ] uk /ˌæn.tiˈnɒk.ɪŋ/ us /ˌæn.t̬iˈnɑː.kɪŋ/
(Definition of “antiknock” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)
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