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A form of matter that is identical to ordinary matter except that it is composed of antielectrons (positrons), antiprotons, and antineutrons.
(General Physics) a form of matter composed of antiparticles, such as antihydrogen, consisting of antiprotons and positrons
an•ti•mat•ter(ˈæn tiˌmæt ər, ˈæn taɪ-)
matter composed only of antiparticles.
A form of matter identical to ordinary matter except that its atoms have opposite electrical charges or magnetic characteristics.
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|Noun||1.||antimatter - matter consisting of elementary particles that are the antiparticles of those making up normal substances|
matter - that which has mass and occupies space; "physicists study both the nature of matter and the forces which govern it"
antiparticle - a particle that has the same mass as another particle but has opposite values for its other properties; interaction of a particle and its antiparticle results in annihilation and the production of radiant energy