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Noun
1. antiparticlePhysics
Wikipedia definition
2. AntiparticleCorresponding to most kinds of particles, there is an associated antiparticle with the same mass and opposite electric charge. For example, the antiparticle of the electron is the positively charged antielectron, or positron, which is produced naturally in certain types of radioactive decay. The laws of nature are very nearly symmetrical with respect to particles and antiparticles.
Read “Antiparticle” on English Wikipedia
Read “反粒子” on Japanese Wikipedia
Read “Antiparticle” on DBpedia

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