Kaon
WordNet
noun
(1) An unstable meson produced as the result of a high-energy particle collision
WiktionaryText
Noun
- any of four unstable subatomic particles, mesons, they are a combination of a strange quark or antiquark and either an up or down quark or antiquark
- K0: strange quark + down antiquark
- K0* (antiparticle of K0): down quark + strange antiquark
- K+: strange quark + up antiquark
- K- (antiparticle of K+): up quark + strange antiquark