| 单词 | upsilon |
| 释义 | upsilon /yoohp"seuh lon', -leuhn, up"-/; esp. Brit. /yoohp suy"leuhn/, n. 1. the 20th letter of the Greek alphabet (Y). 2. the vowel sound represented by this letter. 3. Also called upsilon particle, Physics. any of a family of heavy, short-lived, neutral mesons that are composed of a bottom quark and its antiquark. Symbolically represented by the greek letter Upsilon. [1615-25; < LGk y psilón lit., simple u (to distinguish it from the digraph oi, pronounced the same in LGk)] |
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