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antiknock

[an-tee-nok, an-tahy-, an-tee-nok, an-tahy-] /ˌæn tiˈnɒk, ˌæn taɪ-, ˈæn tiˌnɒk, ˈæn taɪ-/
adjective
1.
noting or pertaining to a substance, as tetraethyllead or ferrocene, used as a fuel additive for an internal-combustion engine to eliminate or minimize knock.
noun
2.
such a substance added to fuel in an internal-combustion engine.
Origin
1920-1925
1920-25; anti- + knock
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for anti knock

antiknock

/ˌæntɪˈnɒk/
noun
1.
a compound, such as lead tetraethyl, added to petrol to reduce knocking in the engine
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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