U, u

/yooh/, n., pl. 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.