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Adjective antiknock has 1 sense
  1. antiknock - (of gasoline) containing tetraethyl lead; "antiknock gasoline"
    Antonyms:     unleaded, leadless (indirect, via leaded)
,Noun antiknock has 1 sense
  1. antiknock - any of various compounds that are added to gasoline to reduce engine knocking
    --1 is a kind of     compound, chemical compound
    --1 has particulars: tetraethyl lead, lead tetraethyl
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