antiknock antiknock  /ˌæn ti ˈnɑk/


  1. (n) any of various compounds that are added to gasoline to reduce engine knocking
  2. (adj) suppressing or eliminating engine knock in combustion engines


  1. Since leaded antiknock compounds accounted for 36% of those sales and a hefty 60% of the profits, Ethyl may have more knocks ahead.
  2. Knocking quality is measured in octane, a 100% antiknock laboratory fluid.
  3. Because methane is h'gh in antiknock value, special high-compression engines which save 15% in fuel consumption are now available for this fuel.
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astral astral
/ˈæ strəl /