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anti- +‎ particle

Alternative forms[edit]


  • IPA(key): /ˈæntiˌpɑɹtɪkəl/


antiparticle (plural antiparticles)

  1. (physics) A subatomic particle corresponding to another particle with the same mass, spin and mean lifetime but with charge, parity, strangeness and other quantum numbers flipped in sign; a particle that has a reversed world line to another.
    • 1988, Stephen Hawking, A Brief History of Time: From the Big Bang to Black Holes (page 75)
      There could be whole antiworlds and antipeople made out of antiparticles. However, if you meet your antiself, don't shake hands!


Usage notes[edit]

  • The symbol for an antiparticle is the symbol for the normal particle plus "bar" (e.g. pbar) or with a bar above the symbol.

See also[edit]