any one of a subgroup of volatile mesons that contain an electrically recharged form with a mass 966 times that of an electron and a neutral form with a mass 974 times that an electron, produced due to a high-energy particle collision. Also called K-meson. See dining table at subatomic particle.
any one of four volatile subatomic particles, mesons, they truly are a mixture of a strange quark or antiquark and either an up or down quark or antiquark
an unstable meson produced as the result of a high-energy particle collision