Definition of U

1. Noun. A base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine.

Exact synonyms: Uracil
Substance meronyms: Ribonucleic Acid, Rna
Generic synonyms: Base, Nucleotide



2. Adjective. (chiefly British) of or appropriate to the upper classes especially in language use.

3. Noun. A heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons.
Exact synonyms: Atomic Number 92, Uranium
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Uranium 235, Uranium 238
Substance meronyms: Pitchblende, Uraninite

4. Noun. The 21st letter of the Roman 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. A variable commonly used for energy density of electric or magnetic fields, also sometimes used for velocity. (09 Oct 1997)

U Pictures

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Lexicographical Neighbors of U

tzolkin
tzolkins
tzuica
tzuris
tædious
tædium
tænia
tænias
tæniasis
tænicide
tæniæ
tête-bêche
tête-de-pont
tête-à-têtes
têtes-de-pont
u (current term)
u-50488
u-drive
u-ie
u-ies
u-score method
u-stem
u-stems
u-turn
u1RNA
uC
uCi
uMMA
uPVC
uakari

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