upsilon /ūp-sīˈlon, ŭp-, ūpˈsi- or upˈsi-/ or ypsilon /ip-sīˈlon or ipˈsi-/

1. The twentieth letter of the Greek alphabet (Υ, υ)
2. As a numeral υˈ = 400, ˌυ = 400000
3. A short-lived heavy subatomic particle produced when beryllium nuclei are bombarded with high-energy protons

• solstitial
• solstitially
• solubilisation
• solubilisations
• solubilise
• solubilised
• solubilises
• solubilising
• solubilities
• solubility
• solubilization
• solubilizations
• solubilize
• solubilized
• solubilizes
• solubilizing
• soluble
• soluble glass
• solum
• solums
• solus
• soluses
• solutal
• solute
• solutes