- (particles) 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.
- French: antipartícule
- German: Antiteilchen
- Italian: antiparticella
- Spanish: antipartícula
Supplemental Details:Sponsor an extended definition for antiparticle for as little as $10 per month. Click here to contact us.