antiparticle meaning

Meaning of antiparticle

What is the full meaning of antiparticle

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]

Example of the word antiparticle placed on a Scrabble board.