Upsilon
noun
1.
the 20th letter of the Greek alphabet (Υ, υ).
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. Symbol: Υ, υ.
noun
1.
the 20th letter in the Greek alphabet (Υ, υ), a vowel, transliterated as y or u
upsilon up·si·lon or yp·si·lon (ŭp’sə-lŏn’, yōōp’-)
n.
Symbol υ The 20th letter of the Greek alphabet.
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