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Noun: upsilon  'yoop-su,lón or 'yoop-su-lun or 'oop-su,lón [N. Amer], úp'sI-lun or 'oop-si,lón [Brit]
  1. The 20th letter of the Greek alphabet

Derived forms: upsilons

Type of: alphabetic character, letter, letter of the alphabet

Part of: Greek alphabet

Encyclopedia: Upsilon, Somme, France