Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. A hypothetical form of matter that is identical to physical matter except that its atoms are composed of antielectrons, antiprotons, and antineutrons.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. Matter that is composed of the antiparticles of those that constitute normal matter.
  • n. A form of matter that has a key property, such as charge, opposite to that of ordinary matter.

from the GNU version of the Collaborative International Dictionary of English

  • n. Matter whch is composed of antiparticles such as antiprotons, positrons, and antineutrons.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. matter consisting of elementary particles that are the antiparticles of those making up normal substances

Etymologies

From anti- +‎ matter. (Wiktionary)

Examples

  • McGregor joins the Brown franchise as Camerlegno Carlo Ventresca, a papal aide that assists Langdon and Vetra in their search for the canister in which the antimatter is contained.

    First Look: Tom Hanks in Ron Howard's Angels and Demons « FirstShowing.net

  • Kobayashi and Maskawa hypothesized the existence of a third family of quarks, which are some of the building blocks from which all matter and antimatter is formed.

    The Nobel Prize in Physics 2008 - Speed Read

  • At the end of the story, the pope -- a religious fanatic -- dies, as does another character who proves to be a science fanatic, equally dangerous and more vicious besides, leaving open the question of whether harnessing antimatter is a good idea or not.

    Archive 2007-02-01

  • A long-term antimatter storage device that may be energized by a low power magnetron and can function autonomously for hundreds of hours on the energy provided by batteries.

    www.hardwarezone.com.sg

  • It releases antimatter, which is then channeled down a tube and reacts with a gaseous matter target.

    Model Ufo | SciFi, Fantasy & Horror Collectibles

  • You know, he could take mathematics and make it fit into reality, and the same with, you know, Dirac, for example, with wedding quantum theory with Einstein's Special Theory of Relativity and then using it to predict antimatter, which is a fantastic prediction.

    NPR Topics: News

  • There's one on the International Space Station right now called the antimatter magnetic spectrometer.

    NPR Topics: News

  • One question is why the universe is dominated by matter rather than sharing the stage with so-called "antimatter."

    Breaking News: CBS News

  • Some kind of antimatter waste field is appearing in orbit, seemingly out of nowhere.

    Demons Of Air And Darkness

  • The island can’t be antimatter, that is if the laws of physics that we know still apply there!

    The Tail Section » Season 4 Finale “There’s No Place Like Home, Part 2″ Afterthoughts

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