upsilon
noun
ˈyüp- ,
ˈəp- ,
-lən ,
British usually
yüp-ˈsī-lən
\
Definition of upsilon
1 : the 20th letter of the Greek alphabet — see Alphabet Table
2 : any of a group of unstable electrically neutral elementary particles of the meson family that have a mass about 10 times that of a proton
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