antiknock :

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an tee nok

  • n  any of various compounds that are added to gasoline to reduce engine knocking
  • s  suppressing or eliminating engine knock in combustion engines
    antiknock properties
    antiknock rating

  • Since leaded antiknock compounds accounted for 36% of those sales and a hefty 60% of the profits, Ethyl may have more knocks ahead.
  • Knocking quality is measured in octane, a 100% antiknock laboratory fluid.
  • In 1935 100-octane (100% antiknock) fuel was a $30-a-gallon laboratory freak; now it runs about 13,000,000 barrels annually.

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