A substance, such as tetraethyl lead, added to gasoline to reduce engine knock.
Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)
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.
Webster's New World
Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.
Other Word Forms of Antiknock
Origin of Antiknock
anti- + knock
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