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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