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English definition of “antiknock”

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noun [U] uk   /ˌæn.tiˈnɒk/ us    /ˌæn.t̬iˈnɑːk/
a chemical that is added to the fuel of a car engine in order to make the fuel burn more effectively, so that the engine stops making a regular knocking sound
adjective [before noun] uk   /-ɪŋ/ us  
(Definition of antiknock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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