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  1. Antimatter - Wikipedia

    In modern physics, antimatter is defined as matter composed of the antiparticles (or "partners") of the corresponding particles in "ordinary" matter, and can be thought of as matter with reversed …

  2. Antimatter | Definition & Facts | Britannica

    Dec 3, 2025 · Antimatter is a substance composed of subatomic particles that have the mass, electric charge, and magnetic moment of the electrons, protons, and neutrons of ordinary …

  3. What Is Antimatter? Definition and Examples

    Aug 30, 2020 · Antimatter is matter composed of antiparticles with the opposite electrical charge of ordinary particles and different quantum numbers. A regular atom has a nucleus of …

  4. ANTIMATTER Definition & Meaning - Merriam-Webster

    The meaning of ANTIMATTER is matter composed of antiparticles.

  5. What is antimatter and where did it go? - CERN

    Dec 15, 2025 · Although antimatter doesn’t seem to be very common in the Universe today, it is frequently created at laboratories like CERN, where particle accelerators simulate the high …

  6. DOE Explains...Antimatter - Department of Energy

    Antimatter is the twin of almost all the subatomic particles that make up our universe. The matter in our universe comes in many forms—solids, liquids, gasses, and plasmas.

  7. What is antimatter? | New Scientist

    The world we live in is overwhelmingly made up of particles of matter. But many of these particles have an antimatter equivalent: a particle identical in every respect, but with an opposite...

  8. ANTIMATTER | definition in the Cambridge English Dictionary

    Add to word list physics matter that consists of particles (= small parts of atoms) that have the opposite electrical characteristics of the particles in regular matter (Definition of antimatter …

  9. Antimatter - CERN

    At CERN, physicists make antimatter to study in experiments. The starting point is the Antiproton Decelerator, which slows down antiprotons so that physicists can investigate their properties.

  10. What Is Antimatter? | Britannica

    antimatter, substance composed of subatomic particles that have the mass, electric charge, and magnetic moment of the electrons, protons, and neutrons of ordinary matter but for which the …