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upsilon

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UK:^*^*UK and possibly other pronunciationsUK and possibly other pronunciations/ˈʌpsɪˌlɒn/, /juːpˈsaɪlən/

US:USA pronunciation: respellingUSA pronunciation: respelling(yo̅o̅p′sə lon′, -lən, up′-; esp. Brit. yo̅o̅p sī′lən)

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up•si•lon n.

the 20th letter of the Greek alphabet (Υ, υ).
the vowel sound represented by this letter.
PhysicsAlso called up′silon par′ticle, any of a family of heavy, short-lived, neutral mesons that are composed of a bottom quark and its antiquark. Symbol: Υ, υ

Late Greek ŷ psīlón literally, simple u (to distinguish it from the digraph oi, pronounced the same in Late Greek)
1615–25

Collins Concise English Dictionary © HarperCollins Publishers::

upsilon /ˈʌpsɪˌlɒn; juːpˈsaɪlən/ n

the 20th letter in the Greek alphabet (Υ, υ), a vowel, transliterated as y or u

Etymology: 17th Century: from Medieval Greek u psilon simple u, name adopted for graphic u to avoid confusion with graphic oi, since pronunciation was the same for both in Late Greek

'upsilon' also found in these entries (note: many are not synonyms or translations):

hyoid

In Lists: Greek Alphabet , more...

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