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1. (n.) upsilon
the 20th letter of the Greek alphabet (Y, &ugr;).
2. upsilon
Also called upsilon particle. any of a family of heavy, short-lived, neutral mesons that are composed of a bottom quark and its antiquark. Symbol:Y, &ugr;
Etymology: (1615–25; < LGk ŷ psīlón lit., simple u (to distinguish it from the diagraph oi, pronounced the same in LGk)
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| Definition of 'upsilon' |
Princeton's WordNet |
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1. (noun) upsilon
the 20th letter of the Greek alphabet
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