an·ti·par·ti·cle /ˈæntɪˌpɑrtɪkəl, ˈænˌtaɪ-/
反粒子
antiparticle
n : 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