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

• fairylike
• fairy-money
• fairy moss
• fairy penguin
• fairy penguins
• fairy ring
• fairy rings
• fairy shrimp
• fairy shrimps
• fairy-stone
• fairy-stones
• fairy stories
• fairy story
• fairy tale
• fairytale
• fairy tales
• fairy wren
• fairy wrens
• fait accompli
• faites vos jeux
• faith
• faith cure
• faith cures
• faithed
• faithful