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Definition of U
1. Adjective. (chiefly British) of or appropriate to the upper classes especially in language use.
Similar to: Upper-class
2. Noun. A base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine.
3. Noun. A heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons.
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Uranium 235, Uranium 238
Substance meronyms: Pitchblende, Uraninite
4. Noun. The 21st letter of the Roman alphabet.
Generic synonyms: Alphabetic Character, Letter, Letter Of The Alphabet
Definition of U
1. Letter. (Latn-def en letter 21 u) ¹
2. Abbreviation. (''British film certificate'') Universal - ''suitable for all ages'' ¹
3. Abbreviation. Under ¹
4. Abbreviation. University ¹
5. Abbreviation. Up, Upper ¹
6. Adjective. (chiefly British) Characteristic of the upper classes, particularly in use of language. ¹
7. Proper noun. A language belonging to the Austro-Asiatic language family which is spoken in China. ¹
8. Letter. (Latn-def en letter 21 u) ¹
9. Noun. (Latn-def en name U u) ¹
10. Noun. A thing in the shape of the letter U ¹
11. Pronoun. (context: abbreviation slang text messaging internet) you (qualifier in text messaging and internet conversations) ¹
12. Abbreviation. Underwater. ¹
¹ Source: wiktionary.com
Medical Definition of U
1.