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What is "antiknock"

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antiknock
Wiktionary
antiknock

a. of an additive added to petroleum/gasoline to reduce the occurrence of engine knock. n. Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)

WordNet
antiknock

  1. adj. (of gasoline) containing tetraethyl lead; "antiknock gasoline"

  2. n. any of various compounds that are added to gasoline to reduce engine knocking