1. 反离子：anion 阴离子 | antiparticle 反离子 | antiproton 反质子
2. 反素粒子：放射性 Radio activity | 反素粒子 Antiparticle | 相對性粒子 Relative particle
noun
1. a particle that has the same mass as another particle but has opposite values for its other properties
interaction of a particle and its antiparticle results in annihilation and the production of radiant energy