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

• drum-belly
• drumble
• drumbled
• drumbledor
• drumbledors
• drumbles
• drumbling
• drum brake
• drum brakes
• drumfire
• drumfires
• drumfish
• drumfishes
• drumhead
• drumhead cabbage
• drumhead court martial
• drumheads
• drum kit
• drum kits
• drumlier
• drumliest
• drumlin
• drumlins
• drumly
• drum machine