Definition of antimatter in English:

antimatter

Syllabification: an·ti·mat·ter
Pronunciation: /ˈantēˌmatər, ˈantī-
 
/

noun

Physics
Molecules formed by atoms consisting of antiprotons, antineutrons, and positrons. Stable antimatter does not appear to exist in our universe.
More example sentences
  • In the enormous densities of the early moments of the Big Bang the result would have been a catastrophic annihilation of matter and antimatter into radiation.
  • There is both matter (such as electrons) and oppositely charged antimatter (such as positrons).
  • Paul Dirac predicted the existence of antimatter with his relativistic wave equation in 1928.

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