from The American Heritage® Dictionary of the English Language, 4th Edition

  • n. The 20th letter of the Greek alphabet. See Table at alphabet.

from Wiktionary, Creative Commons Attribution/Share-Alike License

  • n. The twentieth letter of the Classical and Modern Greek, the twenty-first letter of Old and Ancient.

from the GNU version of the Collaborative International Dictionary of English

  • n. The 20th letter (Υ, υ) of the Greek alphabet, a vowel having originally the sound of � as in room, becoming before the 4th century b. c. that French u or Ger. ü. Its equivalent in English is u or y.

from The Century Dictionary and Cyclopedia

  • n. The Greek letter γ, υ, corresponding to the English u (and y).
  • n. The Greek letter Γ, υ, corresponding to the English u (and y).

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

  • n. the 20th letter of the Greek alphabet


from The American Heritage® Dictionary of the English Language, 4th Edition

Late Greek ū psīlon, simple u (from the fact that oi was given the same pronunciation in Late Greek as u) : ū, hū, the letter U + psīlon, neuter of psīlos, simple (written with one letter as opposed to two).


  • The first reported discovery of a new particle by Lederman's group turned out to be erroneous; initially dubbed the upsilon, it was famously renamed the "oops-Leon."

    American Scientist Online

  • By changing two letters, we can see how things could have been misinterpreted: an original lambda may look like an upsilon, an original theta may look like an Etruscan ef.

    Archive 2010-03-01

  • Scientists recently made sense of an odd jiggle in upsilon andromedae: the wobble's caused by three giant planets orbiting the star.

    The 'Talk-Show Avoidance' Strategy

  • The Greek scholar will look to the Greek letters for Jesus: "iota eta sigma omicron upsilon sigma," which is variously transliterated IHSOYS or IHCOYC, the latter when converted to Latin letters using the common curved sigma variant.

    More on the "H"

  • This spelling seems to be quite old, going back as far as Deecke/Pauli, Etruskische Forschungen und Studien 1881 and when I look for myself at the tiny picture of the statuette provided in Jannot's book, I must admit that I'm pretty sure that I see a iota between the upsilon and the ef too.

    More comedy with the purported Etruscan name Ruifri

  • To add icing to the cake however there is also another instance of the name in Etruscan itself, Ruvries TLE 32, and no iota is present after the upsilon either.

    More comedy with the purported Etruscan name Ruifri

  • Note that the scribe wrote an ancient variant of upside-down upsilon for "five" which is attested elsewhere in Etruscan.

    Problems with Etruscan inscription TLE 890 (or with Etruscologists)

  • Filioque but never και του Υιου


  • The same change may be seen in the Latin 'piscis,' which in English is 'fish,' and the Greek '[pi upsilon rho]' which in English is 'fire.'

    A Strange Manuscript Found in a Copper Cylinder

  • The first, 'All A is all B,' which distributes both subject and predicate, has been called [upsilon], to mark its extreme universality.

    Deductive Logic


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