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Adjective: antiknock  `an-tee'nók
  1. Suppressing or eliminating engine knock in combustion engines
    "antiknock properties"; "antiknock rating"
    - antiknocking
Noun: antiknock  `an-tee'nók
  1. Any of various compounds that are added to petrol to reduce engine knocking

Derived forms: antiknocks

See also: leaded

Type of: chemical compound, compound

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