u

noun

ˈyü 

variants often U

plural u's or us ˈyüz 

often attributive

1

a

: the 21st letter of the English alphabet

b

: a graphic representation of this letter

c

: a speech counterpart of orthographic u

2

: a graphic device for reproducing the letter u

3

: one designated u especially as the 21st in order or class

4

[abbreviation for unsatisfactory]

a

: a grade rating a student's work as unsatisfactory

b

: one graded or rated with a U

5

: something shaped like the letter U

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Words Starting With U

Browse 8,266 words and phrases that start with the letter U, from uakari to Uzbek.

Examples of u in a Sentence

There are three u's in “unusual.”

a word that starts with u

Word History

First Known Use

before the 12th century, in the meaning defined at sense 1a

Phrases Containing u

• double-u

Kids Definition

u

noun

ˈyü

often capitalized

: the 21st letter of the English alphabet

Medical Definition

U

1 of 2 abbreviation

uracil

U

2 of 2 symbol

uranium