upsilon

• POS: Noun
• HYPHEN: up=si=lon

CIDE DICTIONARY

upsilon, n. [Gr. 'y^ psilo`n bare, mere, simple y.].

 The 20th letter (room, becoming before the 4th century b. c. that French u or Ger. Ü. Its equivalent in English is u or y.  [Webster 1913 Suppl.]

OXFORD DICTIONARY

upsilon, n. the twelfth letter of the Greek alphabet.

Etymology

Gk, = slender U f. psilos slender, with ref. to its later coincidence in sound with Gk oi