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

• disjoin
• disjoined
• disjoining
• disjoins
• disjoint
• disjointed
• disjointedly
• disjointedness
• disjointednesses
• disjointing
• disjoints
• disjunct
• disjunction
• disjunctions
• disjunctive
• disjunctively
• disjunctives
• disjunctor
• disjunctors
• disjuncts
• disjuncture
• disjunctures
• disjune
• disjunes
• disk