Definition of 'antimatter'
uncountable noun
In science, antimatter is a form of matter whose particles have characteristics and properties opposite to those of ordinary matter.
[technical]COBUILD Advanced English Dictionary. Copyright © HarperCollins Publishers
noun
a form of matter composed of antiparticles, such as antihydrogen, consisting of antiprotons and positrons
Collins English Dictionary. Copyright © HarperCollins Publishers
Word Frequency
antimatter in American
(ˈæntɪˌmætər ; anˈtimatˌər; ˈæntaɪˌmætər ; anˈtīmatˌər; ˈæntiˌmætər ; anˈtēmatˌər) noun
a form of matter in which the electrical charge or other property of each constituent particle is the reverse of that in the usual matter of our universe: an atom of antimatter has a nucleus of antiprotons and antineutrons surrounded by positrons
Webster’s New World College Dictionary, 4th Edition. Copyright © 2010 by
Houghton Mifflin Harcourt. All rights reserved.
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Used Rarely. antimatter is in the lower 50% of commonly used words in the Collins dictionary
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Source
Definition of antimatter from the
Collins English Dictionary
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