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

• brake blocks
• braked
• brake disc
• brake drum
• brake drums
• brake-fade
• brake fluid
• brake horsepower
• brakeless
• brake light
• brake lights
• brake lining
• brake linings
• brakeman
• brake pads
• brake parachute
• brake parachutes
• brakes
• brake shoe
• brake shoes
• brakesman
• brake van
• brake vans
• brake-wheel
• brake-wheels