composed only of antiparticles, especially antiprotons, antineutrons, and positrons.
Contemporary Examples

Instead, dark matter is its own antimatter, so any pair of particles that meet will destroy each other.
Still No Dark Matter from Space Station Experiment Matthew R. Francis September 20, 2014

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

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

also anti-matter, 1953, from anti- + matter (n.).
A form of matter that consists of antiparticles.

In physics, matter made of antiparticles.


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