antiparticle

Meanings

1. 1
   noun

   a subatomic particle with the same mass and spin as another particle but opposite charge or other quantum numbers

   When an electron meets its antiparticle, the positron, the pair can annihilate and release photons.

Formed from anti- ("opposite, corresponding counterpart") + particle. In particle physics, anti- marks a partner with matching mass and spin but reversed additive quantum numbers.

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