[ 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 an·ti-neu·tron. opposing the building, stockpiling, or use of neutron bombs: The antineutron lobby was outnumbered.

Origin of antineutron

First recorded in 1940–45; anti- + neutron Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

British Dictionary definitions for antineutron

/ (ˌæntɪˈnjuːtrɒn) /


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

Scientific definitions for antineutron

[ ăn′tē-nōōtrŏn′, ăn′tī- ]

The antiparticle that corresponds to the neutron.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.