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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

  1. such a substance added to fuel in an internal-combustion engine.

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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Word History and Origins

Origin of antiknock1

First recorded in 1920–25; anti- + knock

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anti-intellectualismAntikythera

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