- matter composed only of antiparticles, especially antiprotons, antineutrons, and positrons.
Origin of antimatter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
Examples from the Web for antimatter
Instead, dark matter is its own antimatter, so any pair of particles that meet will destroy each other.Still No Dark Matter from Space Station Experiment
Matthew R. Francis
September 21, 2014
On the average, one atom out of every ten million in the universe was an atom of antimatter.
The distribution was unequal of course; antimatter could not exist in contact with ordinary matter.
- a form of matter composed of antiparticles, such as antihydrogen, consisting of antiprotons and positrons
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
Word Origin and History for antimatter
Online Etymology Dictionary, © 2010 Douglas Harper
- A form of matter that consists of antiparticles.
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