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

• occam
• OCCAM
• occamies
• Occamism
• Occamist
• occams
• Occam's razor
• occamy
• occasion
• occasional
• occasional cause
• occasional causes
• occasional conformist
• occasional conformists
• occasionalism
• occasionalisms
• occasionalist
• occasionalists
• occasionalities
• occasionality
• occasionally
• occasional table
• occasional tables
• occasioned
• occasioned by