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[an-tee-mat-er, an-tahy-] /ˈæn tiˌmæt ər, ˈæn taɪ-/
noun, Physics.
matter composed only of antiparticles, especially antiprotons, antineutrons, and positrons.
Origin of antimatter
1950-55; anti- + matter Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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Examples from the web for antimatter
  • antimatter, which annihilates matter upon contact, seems to be rare in the universe.
  • There were only particles of matter and antimatter and light, uniformly filling all space.
  • Even closer to the beginning, complex physical processes set up a small excess of ordinary baryonic matter over antimatter.
  • Positrons are the antimatter equivalent of electrons, and are produced in a rare type of radioactive decay.
  • As the first pieces of matter formed, the charged conditions also created their antimatter counterparts.
  • One should note here that antimatter and negative matter are two entirely different things.
  • Parity violation is not enough to describe the matter-antimatter asymmetry.
  • It might, for instance, explain the preponderance of matter over antimatter in the cosmos.
  • The collision converts the proton into a positron, the antimatter counterpart of an electron, and a recoiling neutron.
  • But cyclic twin matter and antimatter universes is reality to search for further clues.
British Dictionary definitions for antimatter


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
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Word Origin and History for antimatter

also anti-matter, 1953, from anti- + matter (n.).

Online Etymology Dictionary, © 2010 Douglas Harper
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antimatter in Science
A form of matter that consists of antiparticles.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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antimatter in Culture

antimatter definition

In physics, matter made of antiparticles.

The American Heritage® New Dictionary of Cultural Literacy, Third Edition
Copyright © 2005 by Houghton Mifflin Company.
Published by Houghton Mifflin Company. All rights reserved.
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