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English definition of “antiknock”

antiknock

noun [U]     /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 soundPetroleum products especially when used as fuelFuels antiknocking     /-ɪŋ/ adjective [before noun] Petroleum products especially when used as fuelFuels
(Definition of antiknock noun from the Cambridge Advanced Learner's Dictionary & Thesaurus © Cambridge University Press)
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