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n. The 20th letter of the Greek alphabet. See Table at alphabet.

n. The twentieth letter of the Classical and Modern Greek, the twenty-first letter of Old and Ancient.

n. The 20th letter (Υ, υ) of the Greek alphabet, a vowel having originally the sound of � as in room, becoming before the 4th century b. c. that French u or Ger. ü. Its equivalent in English is u or y.

n. The Greek letter γ, υ, corresponding to the English u (and y).

n. The Greek letter Γ, υ, corresponding to the English u (and y).

n. the 20th letter of the Greek alphabet

"The first reported discovery of a new particle by Lederman's group turned out to be erroneous; initially dubbed the upsilon, it was famously renamed the "oops-Leon.""

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