• WordNet 3.6
    • n upsilon the 20th letter of the Greek alphabet
    • ***
Webster's Revised Unabridged Dictionary
    • n Upsilon The 20th letter (Υ, υ) of the Greek alphabet, a vowel having originally the sound as in room, becoming before the 4th century b. c. that French u or Ger. ü. Its equivalent in English is u or y.
    • ***
Century Dictionary and Cyclopedia
    • n upsilon The Greek letter γ, υ, corresponding to the English u (and y).
    • n upsilon The Greek letter Γ, υ, corresponding to the English u (and y).
    • ***


Webster's Revised Unabridged Dictionary
Gr. 'y^ psilo`n bare, mere, simple y,


In literature:

SOCRATES: That is more obscure; yet the form is only due to the quantity, and has been changed by altering omicron upsilon into omicron.
"Cratylus" by Plato
The little son of the queen, Prince Upsilon, was peevish over this and was continually calling for more playthings.
"Walter Pieterse" by Multatuli
It sounds well to be a Kappa Upsilon and we can go around if we like and be as snooty as any of them.
"Betty Lee, Sophomore" by Harriet Pyne Grove
Above the Kappas, and in the same group in the ear, are the two Upsilons, forming a wider pair.
"Astronomy with an Opera-glass" by Garrett Putman Serviss

In poetry:

So small an I as an attention beggar.
The letter you will find me subscript to
Is neither alpha, eta, nor omega,
But upsilon which is the Greek for you.
"Iota Subscript" by Robert Frost

In news:

Members of the Alpha Omega Chapter of Delta Kappa Gamma Society attended a brunch honoring Upsilon State President Angela Pratt at the Historic Park Inn in Mason City.
Upsilon Pi Epsilon ACM Student Chapter Scholarship Award.
COLUMBIA — Maybe the Delta Upsilon fraternity at Kansas State wants Michael Dixon to be its next member.
Upsilon Pi Epsilon ACM Student Chapter Scholarship Award.
According to their national office, Beta Upsilon Chi only allows Christians to be members.
Shelby Buckman, a member of Pi Beta Phi, works on pomping, a process of covering a surface with rolled tissue paper, outside Delta Upsilon on MU campus.
Researchers say the eccentric orbits of Upsilon Andromedae's planets got that way by interacting with a wayward world.
Upsilon Chi, Wayne Community College's chapter of Phi Theta Kappa, the international honor society for two-year colleges, recently received more than a dozen awards at its annual regional conference.
In a letter to fraternity members, national organization leaders say members of the Lambda-Upsilon chapter violated social function and alcohol policy.

In science:

The sPHENIX design also offers the ability to add additional detectors in the central region which will enable new key physics, such as heavy quark jets and separated upsilon states.
The Physics of sPHENIX
P (8) J ] distributions are not exactly the same throughout the 0 ≤ p⊥ ≤ 15 GeV interval where Upsilon data exists.
Color-octet quarkonia production II
We turn now to the bottomonium sector and consider Upsilon production at the Tevatron within the rapidity interval |y | ≤ 0.4.
Color-octet quarkonia production II
Fig.1 shows how well the lowest spin-averaged states of the Upsilon spectrum can be reproduced . A closer look reveals that the effects of light dynamical quarks shift the numbers closer to their experimental values.
Physics of Heavy Quarks from Lattice QCD
The Upsilon hyperfine splittings, shown in Fig.2, are more sensitive to the details of the lattice action: quenching tends to underestimate them, and accurate values are needed for M and c1 (which undergoes substantial renormalisation).
Physics of Heavy Quarks from Lattice QCD