- 1. n. the 20th letter of the Greek alphabet Source: wordnet
- 2. The 20th letter (U, u) 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. ü. Its equivalent in English is u or y. Source: webster
- 3. The 20th letter (U, u) of the Greek alphabet, a vowel havingoriginally the sound of oo as in room, becoming before the 4thcentury b. c. that French u or Ger. ü. Its equivalent in English is uor y. Source: adambom
- 4. n:100 n. the 20th letter of the Greek alphabet Source: ecdict
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upsilon
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