upsilon

Fetched 2026-10-26 (cache).

Synonyms: epsilon, ypsilon

Antonyms: epsilon, ypsilon

Related words from Datamuse; suggestions, not definitions.

Noun

1. The twentieth letter of [[Classical Greek|Classical]] and [[Modern Greek]]; the twenty-second letter of [[Old Greek|Old]] and [[Ancient Greek]].
2. {{lb|en|particle}} An [[upsilon meson]], or [[bottomonium]].

Source: Wiktionary · CC BY-SA 4.0 (Wiktionary dump) · cached copy, not a rewrite.