U

noun, plural U’s or Us, u’s or us.
1.
the 21st letter of the English alphabet, a vowel.
2.
any spoken sound represented by the letter U or u, as in music, rule, curious, put, or jug.
3.
something having the shape of a U .
4.
a written or printed representation of the letter U or u.
5.
a device, as a printer’s type, for reproducing the letter U or u.
noun
1.
a Burmese title of respect applicable to a man: used before the proper name.
adjective, Informal.
1.
characteristic of or appropriate to the upper class, especially of Great Britain.
pronoun, Pronunciation Spelling.
1.
you :
Shoes Fixed While U Wait.
Symbol.
1.
(on a packaged product) certified as kosher by the Union of Orthodox Hebrew Congregations.
2.
the 21st in order or in a series, or, when I is omitted, the 20th.
3.
Chemistry. uranium.
4.
Biochemistry. uracil.
5.
Thermodynamics. internal energy.
6.
British. a designation for motion pictures determined as being acceptable for viewing by all age groups.
Compare A (def 11), X (def 9).
1.
and.
1.
uncle.
2.
uniform.
3.
union.
4.
unit.
5.
united.
6.
university.
7.
unsatisfactory.
8.
upper.
1.
and.
1.
uniform.
2.
unit.
3.
unsatisfactory.
4.
upper.
noun (pl) u’s, U’s, Us
1.
the 21st letter and fifth vowel of the modern English alphabet
2.
any of several speech sounds represented by this letter, in English as in mute, cut, hurt, sure, pull, or minus
3.

something shaped like a U
(in combination): a U-bolt, a U-turn

symbol
1.
united
2.
unionist
3.
university
4.
(in Britain)

universal (used to describe a category of film certified as suitable for viewing by anyone)
(as modifier): a U film

5.
(chem) uranium
6.
(biochem) uracil
abbreviation
7.
(text messaging) you
adjective
8.
(Brit, old-fashioned, informal) (esp of language habits) characteristic of or appropriate to the upper class Compare non-U
noun
1.
a Burmese title of respect for men, equivalent to Mr
abbreviation
1.
(maths) union
2.
unit
3.
united
4.
university
5.
upper

U 3

The symbol for the element uranium.
U

Abbreviation of uracil

The symbol for uranium.

uranium
(y-rā’nē-əm)
Symbol U
A heavy, silvery-white, highly toxic, radioactive metallic element of the actinide series. It has 14 known isotopes, of which U 238 is the most naturally abundant, occurring in several minerals. Fissionable isotopes, especially U 235, are used in nuclear reactors and nuclear weapons. Atomic number 92; atomic weight 238.03; melting point 1,132°C; boiling point 3,818°C; specific gravity 18.95; valence 2, 3, 4, 5, 6. See Periodic Table.
u
up quark
U
1.
internal energy
2.
[residential] unit
3.
units
4.
uracil
5.
uranium
6.
you
u.
1.
unit
2.
units
3.
upper
U.
1.
uncle
2.
University
3.
unsatisfactory