antimatter

[ 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

First recorded in 1950–55; anti- + matter
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Examples from the Web for antimatter

  • Instead, dark matter is its own antimatter, so any pair of particles that meet will destroy each other.

  • 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
/ (ˈæntɪˌmætə) /

noun

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

Science definitions for antimatter

antimatter
[ ăntĭ-măt′ər ]

A form of matter that consists of antiparticles.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.

Culture definitions for antimatter

antimatter

In physics, matter made of antiparticles.

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.