Definitions of upsilon [ˈyup səˌlɒn, -lən, ˈʌp-;]

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Definition of 'upsilon'

Random House Webster's College Dictionary

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)

Definition of 'upsilon'

Princeton's WordNet

1. (noun) upsilon
the 20th letter of the Greek alphabet

'upsilon' - Nearby Entries
upside upside down upside-down upsilon upstage upstager upstair

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