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3 definitions found

From: DICT.TW English-Chinese Dictionary 英漢字典

 up·si·lon /ˈupsəˌlɑn, ˈjup, ˈʌp, lən, ||jupˈsaɪlən/
 希蠟語第20個字母

From: Webster's Revised Unabridged Dictionary (1913)

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

From: WordNet (r) 2.0

 upsilon
      n : the 20th letter of the Greek alphabet