a all of whose properties, as mass, spin, or charge, have the same magnitude as but, where appropriate, the opposite sign of a specific ; neutral pions, photons, and gravitons are considered to be their own antiparticles:
The positron is the antiparticle of the electron.
Compare , (def 3).
any of a group of elementary particles that have the same mass and spin as their corresponding particle but have opposite values for all other nonzero quantum numbers. When a particle collides with its antiparticle, mutual annihilation occurs
A subatomic particle, such as an antiproton, having the same mass as its corresponding particle, but opposite values of other properties such as charge, parity, spin, and direction of magnetic moment. For example, the antiparticle of the electron is the positron, which has a charge that is equal in magnitude to that of the electron but opposite in sign. Some particles, such as photons, are nondistinct from their antiparticles. When a particle and its antiparticle collide, they may annihilate one other and produce other particles.
In physics, a rare form of subatomic matter that is a mirror image of normal matter. The antiparticle corresponding to an elementary particle has the same mass as the particle but is opposite in all other properties. The antiparticle corresponding to an electron is a positron, which has the same mass as an electron but a positive charge. Antiprotons have the same mass as protons but a negative charge. When matter and antimatter come together, the two particles annihilate each other, converting their mass into energy or into other types of particles.
Note: As far as scientists can tell, there is almost no naturally occurring antimatter in the universe, although it is possible to make antimatter in particle accelerators.
398?–319 b.c, Macedonian statesman and general: regent of Macedonia 334–323. Historical Examples Plutarch says that Alexander wrote to Antipater that he had been wounded in the thigh with a dagger, but did not say by whom. The Anabasis of Alexander Arrian of Nicomedia Two proposals were made to him—one by Olympias, and one by Antipater. […]
opposed, averse, or contrary; having or showing : They were antipathetic to many of the proposed changes. causing or likely to cause : The new management was antipathetic to all of us. Historical Examples It is antipathetic to him not only as a philosopher, but also as a great writer. Phaedrus Plato The whole place […]
any disease-producing agent, especially a virus, bacterium, or other microorganism. Contemporary Examples When I started the job in 1992 it was well established as a pathogen, and that was the end of pink burgers for you and for me. Be Afraid of Your Food: An Epidemiologist’s Sensible Advice Amanda Kludt March 15, 2013 This last […]
Pathology. capable of producing disease: pathogenic bacteria. Contemporary Examples pathogenic bacteria from the remains can get into water supplies. Haiti’s Grisly Problem Cyril Wecht January 18, 2010 Historical Examples Instead of that, the legislators permit the microbes of criminality to develop their pathogenic powers in society. The Positive School of Criminology Enrico Ferri Every one, […]