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

• isoflavone
• isogamete
• isogametes
• isogametic
• isogamic
• isogamies
• isogamous
• isogamy
• isogenetic
• isogenic
• isogenies
• isogenous
• isogeny
• isogeotherm
• isogeothermal
• isogeothermals
• isogeothermic
• isogeothermics
• isogeotherms
• isogloss
• isoglossal
• isoglosses
• isoglottal
• isoglottic
• leasing-makers