antiknock

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adjective an·ti·knock \ˌan-tē-ˈnäk, ˌan-tī-\
variants: or

anti–knock

Definition of antiknock

  1. :  serving or intended to prevent detonation in the combustion process of an internal-combustion engine an antiknock agent an anti-knock fuel additive

1921

First Known Use of antiknock

1921

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