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antiknock

American  
[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

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

antiknock British  
/ 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

Etymology

Origin of antiknock

First recorded in 1920–25; anti- + knock

Example Sentences

Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.

Antiknock gasoline adulterants, like tetraethyl lead, help reduce the pinking, but why no one knows.

From Time Magazine Archive

Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023

Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.