antimatter

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

noun

Physics.

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

antimatter

/ ˈæntɪˌmætə /

noun

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

antimatter

1. A form of matter that consists of antiparticles.

antimatter

1. In physics, matter made of antiparticles.

Word History and Origins

Origin of antimatter¹

First recorded in 1950–55; anti- + matter

Example Sentences

Such simulations could shed light on major open questions in physics, including the imbalance of matter and antimatter, the creation of heavy elements inside supernovae, and the behavior of matter at ultra-high densities.

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According to physicists, the early universe should have contained equal amounts of matter and antimatter.

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According to current understanding, the early universe should have contained nearly equal amounts of matter and antimatter.

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Scientists believe that the answer to understanding why matter won – and we exist – lies in studying a particle called the neutrino and its antimatter opposite, the anti-neutrino.

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One question is why the universe has more matter than antimatter if the Big Bang created both in equal measure.

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