antiknock Meaning, definition in Cambridge English Dictionary
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Meaning of "antiknock" - English Dictionary

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antiknocknoun [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   us   /-ɪŋ/
(Definition of antiknock from the Cambridge Advanced Learners Dictionary & Thesaurus © Cambridge University Press)
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