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

Type of: meson, mesotron

• wash drawing
• wash leather
• wash off
• wash one's hands
• wash-and-wear
• wash-hand basin
• wash-hand stand
• washable
• washables
• washbag
• washbasin
• washboard
• washbowl
• washcloth
• washday
• washed
• washed-out
• washed-up
• washer
• washerman
• washerwoman
• washhouse
• washing
• washing day
• washing machine