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[an-tee-noo-tron, -nyoo-, an-tahy-] /ˌæn tiˈnu trɒn, -ˈnyu-, ˌæn taɪ-/
noun, Physics.
an elementary particle having no charge and having a mass and spin equal to that of the neutron but with magnetic moment opposite to that of the neutron; the antiparticle of the neutron.
Also, anti-neutron. opposing the building, stockpiling, or use of neutron bombs:
The antineutron lobby was outnumbered.
1940-45; anti- + neutron Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for antineutron
  • So, taking the opposite of all of those charges still adds up to zero net charge, resulting in an antineutron.
  • It becomes evident why there is such a thing as an antineutron.
British Dictionary definitions for antineutron


the antiparticle of a neutron; a particle having the same mass as the neutron but a magnetic moment of opposite sign
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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antineutron in Science
  (ān'tē-n'trŏn', ān'tī-)   
The antiparticle that corresponds to the neutron.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Article for antineutron

antiparticle of the ordinary neutron, first produced in 1956 at the Bevatron particle accelerator at the University of California, Berkeley, by passing an antiproton beam through matter. Antineutrons were created when antiprotons in the beam exchanged their negative charge with nearby protons, which have a positive charge. The antineutrons were detected through their annihilation reactions with neutrons and protons.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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