up·si·lon /ˈupsəˌlɑn, ˈjup, ˈʌp, lən, ||jupˈsaɪlən/
希蠟語第20個字母
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.
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upsilon
n : the 20th letter of the Greek alphabet