Antiknock meaning

ăntĭ-nŏk
A substance, such as tetraethyl lead, added to gasoline to reduce engine knock.
noun
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Of or having to do with a substance added to the fuel of internal-combustion engines to reduce or eliminate explosive noise resulting from too rapid combustion.
adjective
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Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.
adjective
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Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)
noun
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Origin of antiknock

  • anti- +‎ knock

    From Wiktionary