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upsilon.

The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.

7 characters3 syllables approx.English language

Meaning & usage

noun/ˈ(j)uːpsɪˌlɒn/UK/ˈ(j)ʊpsɪˌlɒn/UK/ˈʌpsɪˌlɒn/UK/(j)uːpˈsaɪlən/UK
  1. The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.

  2. An upsilon meson, or bottomonium.

    particle
Where this word comes from

From Ancient Greek ὖ ψιλόν (û psilón, “simple Υ”).

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upsilon studioupsilon workshello, upsilon

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Definitions, grammatical labels, IPA, etymology and examples: Wiktionary contributors, extracted by Kaikki / Wiktextract. Adapted under CC BY-SA 4.0. Selected fields and authored examples are shown; third-party quotations and audio are omitted. See contributor history.

Last enriched 2026-09-10. Definitions are in English. Romanizations are shown when supplied by the source; syllable estimates are omitted for unsupported scripts.