upsilon

/juหpหˆsaษช.lษ™n/

IPA: /AH1 P S AH0 L AA0 N/

noun
  1. 1

    The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.

  2. 2

    (particle physics) An upsilon meson, or bottomonium.

Synonyms

Source: https://en.wiktionary.org/wiki/upsilon