Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A substance, such as tetraethyl lead, added to gasoline to reduce engine knock.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • adjective of an additive added to petroleum/gasoline to reduce the occurrence of engine knock.
  • noun Such a substance, usually tetraethyl lead (also MMT, MTBE and ethanol)

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • noun any of various compounds that are added to gasoline to reduce engine knocking
  • adjective suppressing or eliminating engine knock in combustion engines

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

anti- +‎ knock

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Examples

  • They replaced the last of the lead-like antiknock with ethanol in big part due toADM.

    The Volokh Conspiracy » Non-Ethanol Gas in the DC Area: 2009

  • Distillate fuels and heavy oils were heated under pressure in large drums until they cracked into smaller molecules with better antiknock characteristics.

    Cracking 2008

  • It was then discovered that cracked gasoline was actually preferable to “straight run” gasoline because it had much superior antiknock properties.

    The Prize Daniel Yergin 2008

  • Moreover, cracked gasoline actually had a much better antiknock value than natural gasoline, which meant more power and allowed for higher-compression engines.

    The Prize Daniel Yergin 2008

  • It was then discovered that cracked gasoline was actually preferable to “straight run” gasoline because it had much superior antiknock properties.

    The Prize Daniel Yergin 2008

  • Moreover, cracked gasoline actually had a much better antiknock value than natural gasoline, which meant more power and allowed for higher-compression engines.

    The Prize Daniel Yergin 2008

  • The important qualities for gasoline are octane number (antiknock), volatility (starting and vapor lock), and vapor pressure (environmental control).

    Petroleum refining 2007

  • Tetraethyl lead, gasoline antiknock additive, produced by Thomas Midgley (1889–1994).

    5. Technological Developments 2001

  • ATL Racing Fuel Cells, Ramsey, NJ, May 30, 2008: Most unleaded racing fuels contain "ethanol" as an antiknock, but ethanol settles out if moisture gets into your fuel cell.

    Inside Track Breaking News Blog 2009

  • Check your car’s owner manual for the recommended fuel (unleaded gasoline versus diesel) and octane rating or antiknock index (on the yellow sticker affixed to the pump).

    How To Buy & Sell just about Everything Jeff Wuorio 2003

Comments

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  • Antiknock antiknock.

    January 24, 2016

  • Who's not there?

    January 24, 2016