upsilon
Americannoun
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the 20th letter of the Greek alphabet (Υ, υ).
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the vowel sound represented by this letter.
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Also called upsilon particle. Physics. any of a family of heavy, short-lived, neutral mesons that are composed of a bottom quark and its antiquark. Υ, υ
noun
Etymology
Origin of upsilon
First recorded in 1615–25; from Late Greek ŷ psīlón, literally, “simple u ” (to distinguish it from the digraph oi, pronounced the same in Late Greek )
Example Sentences
Examples are provided to illustrate real-world usage of words in context. Any opinions expressed do not reflect the views of Dictionary.com.
A Delta Upsilon fraternity member was injured when he fell from a fire escape at the Sigma Phi Epsilon house in September 2015.
From Seattle Times • Nov. 13, 2019
Protesters occupied the Phi Psi fraternity house and surrounding area for four days, calling on the school administration to dissolve the chapter and the college’s other fraternity, Delta Upsilon.
From Fox News • May 1, 2019
Students have said they will not be happy until the college shuts down both Phi Psi and Delta Upsilon.
From Slate • Apr. 30, 2019
Delta Upsilon fraternity told Philadelphia Magazine that it read the documents "with total revulsion" and said they "do not reflect the values" of the group.
From BBC • Apr. 30, 2019
"After the I.R.S., my gambling debts, the Sierra Club, and Psi Upsilon, you shall have everything."
From Michelangelo's Shoulder by Wetterau, John Moncure
Definitions and idiom definitions from Dictionary.com Unabridged, based on the Random House Unabridged Dictionary, © Random House, Inc. 2023
Idioms from The American Heritage® Idioms Dictionary copyright © 2002, 2001, 1995 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company.
