antimatter

[ an-tee-mat-er, an-tahy- ]

Phonetic (Standard)IPA

noun

, Physics.

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

antimatter

/ ˈæntɪˌmætə /

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

antimatter

/ ăn′tĭ-măt′ər /

antimatter

First recorded in 1950–55; anti- + matter

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

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

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

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