antimatter

1. Matter consisting of elementary particles that are the antiparticles of those making up normal substances (synset 114606715)
   is a type of: matter - that which has mass and occupies space
   substance holonym: 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

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