antiparticle

anti- +‎ particle

• anti-particle

• 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!

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

• self-conjugate