Also anti-neutron. opposing the building, stockpiling, or use of neutron bombs: The antineutron lobby was outnumbered.
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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
Scientific definitions for antineutron
The antiparticle that corresponds to the neutron.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.