antiknock

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

Definition of antiknock 

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

First Known Use of antiknock

1921, in the meaning defined above

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The first known use of antiknock was in 1921

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evasion of direct action or statement

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