Bible Dictionaries
Upsilon

Webster's Dictionary

(n.) The 20th letter (/, /) 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. u. Its equivalent in English is u or y.

Bibliography Information
Webster, Noah. Entry for 'Upsilon'. Noah Webster's American Dictionary. https://www.studylight.org/​dictionaries/​eng/​web/​u/upsilon.html. 1828.