ANTIKNOCK

antiknock, antiknocking

(adjective) suppressing or eliminating engine knock in combustion engines; “antiknock properties”; “antiknock rating”

antiknock

(noun) any of various compounds that are added to gasoline to reduce engine knocking

Source: WordNet® 3.1

Etymology

Adjective

antiknock (not comparable)

Of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.

Noun

antiknock (plural antiknocks)

Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)

Source: Wiktionary

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