noun Physics.

  1. matter composed only of antiparticles, especially antiprotons, antineutrons, and positrons.


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

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

  1. A form of matter that consists of antiparticles.

In physics, matter made of antiparticles.

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