英 [ʌp'saɪlən; juːp-; 'ʊpsɪlɒn; 'juːp-] 美 ['ʊpsɪlɑn]
  • n. 希腊语的第20个字母
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upsilon 希腊字母表的第20个字母

来自希腊语u psilon, 即仅u音,比较epsilon.

upsilon (n.)
20th letter of the Greek alphabet, 1640s, from Greek u psilon, literally "a mere (or bare) 'u;' " so called in later Greek in reference to its sound. The exact reason is variously explained, but it seems to have had something to do with distinguishing it from diphthongs.