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

• gust
• gustable
• gustation
• gustations
• gustative
• gustatory
• gusted
• gustful
• gustie
• gustier
• gustiest
• gustiness
• gustinesses
• gusting
• gust-lock
• gust-locks
• gusto
• gustos
• gusts
• gusty
• gut
• GUT
• gutbucket
• gutbuckets
• gutcher