Hypertext Webster Gateway: "upsilon"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
upsilon
n : the 20th letter of the Greek alphabet
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