anti knock

antiknock

[an-tee-nok, an-tahy-, an-tee-nok, an-tahy-]
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:
1920–25; anti- + knock

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
antiknock (ˌæntɪˈnɒk)
 
n
a compound, such as lead tetraethyl, added to petrol to reduce knocking in the engine

Collins English Dictionary - Complete & Unabridged 10th Edition
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