Dictionary.com
definitions
  • synonyms

antimatter

[an-tee-mat-er, an-tahy-]
See more synonyms for antimatter on Thesaurus.com
noun Physics.
  1. matter composed only of antiparticles, especially antiprotons, antineutrons, and positrons.
Show More

Origin of antimatter

First recorded in 1950–55; anti- + matter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for antimatter

Contemporary Examples

Historical Examples

  • On the average, one atom out of every ten million in the universe was an atom of antimatter.

    Psichopath

    Gordon Randall Garrett

  • The distribution was unequal of course; antimatter could not exist in contact with ordinary matter.

    Psichopath

    Gordon Randall Garrett

British Dictionary definitions for antimatter

antimatter

noun
  1. a form of matter composed of antiparticles, such as antihydrogen, consisting of antiprotons and positrons
Show More
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

n.

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

Show More
Online Etymology Dictionary, © 2010 Douglas Harper
antimatter in Science

antimatter

[ăn′tĭ-măt′ər]
  1. A form of matter that consists of antiparticles.
Show More
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
antimatter in Culture

antimatter

In physics, matter made of antiparticles.

Show More
The New Dictionary of Cultural Literacy, Third Edition Copyright © 2005 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.