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

• pituita
• pituitaries
• pituitary
• pituitary bodies
• pituitary body
• pituitary gland
• pituitary glands
• pituitas
• pituite
• pituites
• pituitrin
• pituitrins
• pituri
• pituris
• pit village
• pit villages
• pit viper
• pit vipers
• pity
• pitying
• pityingly
• pity parties
• pity party
• pityriases
• pityriasis