Definitions for upsilonˈyup səˌlɒn, -lən, ˈʌp-; esp. Brit. yupˈsaɪ lən
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Random House Webster's College Dictionary
up•si•lonˈyup səˌlɒn, -lən, ˈʌp-; esp. Brit. yupˈsaɪ lən(n.)
the 20th letter of the Greek alphabet (Y, υ).
Category: Language/Linguistics
Also called up′silon par`ticle. any of a family of heavy, short-lived, neutral mesons that are composed of a bottom quark and its antiquark. Symbol:Y, υ
Category: Physics
Origin of upsilon:
1615–25; < LGk ŷ psīlón lit., simple u (to distinguish it from the diagraph oi, pronounced the same in LGk
Princeton's WordNet
upsilon(noun)
the 20th letter of the Greek alphabet
Wiktionary
upsilon(Noun)
The twentieth letter of the Classical and Modern Greek, the twenty-first letter of Old and Ancient.
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