anti-particle

/AE1 N T IY0 P AA0 R T AH0 K AH0 L/
noun
  1. 1

    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.

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Source: https://en.wiktionary.org/wiki/anti-particle, https://en.wiktionary.org/wiki/antiparticle