1. An unstable meson produced as the result of a high-energy particle collision
   - kaon, kappa-meson, k-meson

Type of: meson, mesotron

• unbending
• unbeneficed
• unbent
• unbiased
• unbiassed
• unbidden
• unbigoted
• unbind
• unbitter
• unbleached
• unblemished
• unblended
• unblessed
• unblinking
• unblinkingly
• unblock
• unbloody
• unblushing
• unblushingly
• unbodied
• unbolt
• unbolted
• unbooked
• unbordered
• unborn