Anti matter

antimatter

[an-tee-mat-er, an-tahy-]
noun Physics.
matter composed only of antiparticles, especially antiprotons, antineutrons, and positrons.

Origin:
1950–55; anti- + matter

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World English Dictionary
antimatter (ˈæntɪˌmætə)
 
n
a form of matter composed of antiparticles, such as antihydrogen, consisting of antiprotons and positrons

Collins English Dictionary - Complete & Unabridged 10th Edition
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Etymonline
Word Origin & History

antimatter
also anti-matter, 1953, from anti- + matter.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
antimatter   (ān'tĭ-māt'ər)  Pronunciation Key 
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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American Heritage
Cultural Dictionary

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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