antiknock

[ an-tee-nok, an-tahy-, an-tee-nok, an-tahy- ]
/ ˌæn tiˈnɒk, ˌæn taɪ-, ˈæn tiˌnɒk, ˈæn taɪ- /

adjective

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

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

Nearby words

  1. antihormone,
  2. antihuman,
  3. antihuman globulin,
  4. antihydrogen,
  5. antihypertensive,
  6. antikythera,
  7. antilegomena,
  8. antilepton,
  9. antilife,
  10. antilithic

Origin of antiknock

First recorded in 1920–25; anti- + knock

Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019


British Dictionary definitions for antiknock

antiknock

/ (ˌæntɪˈnɒk) /

noun

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