Upsilon

//ˈ(j)upsɪˌlɑn// noun

noun ·Rare ·Advanced level

Definitions

Noun
  1. 1
    The twentieth letter of Classical and Modern Greek; the twenty-second letter of Old and Ancient Greek.
  2. 2
    the 20th letter of the Greek alphabet wordnet
  3. 3
    An upsilon meson, or bottomonium. particle

Synonyms

All synonyms
ypsilon

Example

More examples

"In March 1999, Marcy and Butler announced the detection of the first true other "solar system" in which they found evidence of 3 planets orbiting a single star. The star is called Upsilon Andromedae."

Etymology

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

Related phrases

upsilon particleancient greekclassical greekmodern greekold greekupsilon meson

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Data sourced from Wiktionary, WordNet, CMU, and other open linguistic databases. Updated March 2026.