antimatter

Meanings

1. 1
   noun

   matter composed of antiparticles corresponding to the particles in ordinary matter

   Scientists can produce tiny quantities of antimatter and confine charged antiparticles in electromagnetic traps.

Formed from anti- + matter. Arthur Schuster coined the word in 1898 in a speculative sense; physicists began using it in its modern sense after antiparticles were predicted and observed in the twentieth century.

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