antimatter
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an·ti·mat·ter
(ăn′tē-măt′ər, ăn′tī-)n.
A form of matter that is identical to ordinary matter except that it is composed of antielectrons (positrons), antiprotons, and antineutrons.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
antimatter
(ˈæntɪˌmætə)n
(General Physics) a form of matter composed of antiparticles, such as antihydrogen, consisting of antiprotons and positrons
Collins English Dictionary – Complete and Unabridged, 12th Edition 2014 © HarperCollins Publishers 1991, 1994, 1998, 2000, 2003, 2006, 2007, 2009, 2011, 2014
an•ti•mat•ter
(ˈæn tiˌmæt ər, ˈæn taɪ-)n.
matter composed only of antiparticles.
[1950–55]
Random House Kernerman Webster's College Dictionary, © 2010 K Dictionaries Ltd. Copyright 2005, 1997, 1991 by Random House, Inc. All rights reserved.
an·ti·mat·ter
(ăn′tĭ-măt′ər) A form of matter identical to ordinary matter except that its atoms have opposite electrical charges or magnetic characteristics.
The American Heritage® Student Science Dictionary, Second Edition. Copyright © 2014 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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Noun | 1. | antimatter - matter consisting of elementary particles that are the antiparticles of those making up normal substances matter - that which has mass and occupies space; "physicists study both the nature of matter and the forces which govern it" antiparticle - a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy |
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