antiknock

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an·ti·knock

 (ăn′tĭ-nŏk′)
n.
A substance, such as tetraethyl lead, added to gasoline to reduce engine knock.

antiknock

(ˌæntɪˈnɒk)
n
(Automotive Engineering) a compound, such as lead tetraethyl, added to petrol to reduce knocking in the engine

an•ti•knock

(ˌæn tiˈnɒk, ˌæn taɪ-)

adj.
of, pertaining to, or being a material added to fuel for an internal-combustion engine to eliminate or minimize knock.
[1920–25]
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.antiknock - any of various compounds that are added to gasoline to reduce engine knockingantiknock - any of various compounds that are added to gasoline to reduce engine knocking
lead tetraethyl, tetraethyl lead - a clear oily poisonous liquid added to gasoline to prevent knocking
chemical compound, compound - (chemistry) a substance formed by chemical union of two or more elements or ingredients in definite proportion by weight
Adj.1.antiknock - suppressing or eliminating engine knock in combustion engines; "antiknock properties"; "antiknock rating"
leaded - treated or mixed with lead; "leaded gasoline"; "leaded zinc"
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