[yoo] 
| 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. |
[oo] ,| a Burmese title of respect applicable to a man: used before the proper name. |
| u 1 or U (yōō) n. pl. u's or U's also us or Us
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u
U 3
The symbol for the element uranium.
U
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uranium (y -rā'nē-əm) Pronunciation Key
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. |