ANTIPARTICLE is validvalid

[n ANTIPARTICLES]

164,349 of 196,601 in NWL2023·also valid in CSW24

the 'pair' of an elementary particle, particle and antiparticle being mutually destructive, having the same mass and spin but having opposite values for their other properties (e.g. charge, baryon number, strangeness) [n -S]