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

• kangaroo rats
• kangaroos
• kangaroo-thorn
• kangaroo-thorns
• kangaroo vine
• kangaroo vines
• kangas
• kangha
• kanghas
• kangs
• kanji
• kanjis
• Kannada
• kans
• Kans.
• kanses
• kant
• kantar
• kantars
• kantela
• kantele
• kanteles
• kanten
• kantens
• kantha