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Noun
1. antimatterPhysics
Wikipedia definition
2. AntimatterIn particle physics, antimatter is the extension of the concept of the antiparticle to matter, where antimatter is composed of antiparticles in the same way that normal matter is composed of particles. For example, a positron (the antiparticle of the electron or e+) and an antiproton (p) can form an antihydrogen atom in the same way that an electron and a proton form a "normal matter" hydrogen atom.
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