Upsilon Definition
ŭpsə-lŏn, yo͝op-
noun
The twentieth letter of the Greek alphabet (Υ, υ)
Webster's New World
Any of a group of short-lived elementary particles having a mass about ten times greater than that of a proton.
Webster's New World
Other Word Forms of Upsilon
Noun
Singular:
upsilon
Plural:
upsila, upsilonsOrigin of Upsilon
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)
From American Heritage Dictionary of the English Language, 5th Edition
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