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| up·si·lon [ úpsi lòn, ypsi lòn ] (plural up·si·lons) |
noun |
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| Definition: |
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20th letter of Greek alphabet: the 20th letter of the Greek alphabet, represented in the English alphabet as "y" or "u"
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| [Mid-17th century. < Greek u psilon "simple u" (to distinguish it from the diphthong oi) < psilon, form of psilos "simple"] |
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