Upsilon

2 definitions found

From The Collaborative International Dictionary of English v.0.48 [gcide]:

  Upsilon \Up"si*lon\, n. [Gr. 'y^ psilo`n bare, mere, simple y.]
     The 20th letter ([Upsilon], [upsilon]) of the Greek alphabet,
     a vowel having originally the sound of [=oo] as in room,
     becoming before the 4th century b. c. that French u or Ger.
     ["u]. Its equivalent in English is u or y.
     [Webster 1913 Suppl.]



From WordNet (r) 2.0 [wn]:

  upsilon
       n : the 20th letter of the Greek alphabet