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Upsilon
/juːpˈsaɪ.lən/
The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.
📖 Definitions of "Upsilon"
noun
- 1
The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.
- 2
(particle physics) An upsilon meson, or bottomonium.
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