u

/ju:/
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u

A student writes the letter u in her notebook.

Definition

  1. Noun:

    • The 21st letter of the modern English alphabet: A letter, written in uppercase as "U" and lowercase as "u".
    • A representation of the sound /juː/ or /ʌ/: The speech sound associated with this letter, as in "use" (/juːz/) or "cup" (/kʌp/).
    • (Chemistry) Symbol for uranium: The chemical symbol for the radioactive metallic element uranium (atomic number 92).
    • (Biochemistry) Abbreviation for uracil: In molecular biology, a nitrogenous base found in RNA.

  2. Adjective (chiefly British):

    • Upper-class; characteristic of the upper social class: Used to describe language, behavior, or style considered typical of the upper class, especially in contrast to "non-U" (non-upper-class).
Examples of Usage

  • Noun:

    • The word "umbrella" starts with the letter u.
    • Uranium, represented by the symbol U, is used in nuclear reactors.
    • In RNA, u (uracil) pairs with adenine.

  • Adjective:

    • Her pronunciation was considered very U.
    • Using the term "serviette" instead of "napkin" was once deemed non-U.
Advanced Usage
  • "U-turn": A complete reversal of policy, opinion, or direction. (Note: This is a compound word listed separately as a variant).
  • In academic grading: In some educational systems, "U" can stand for "Ungraded" or "Unclassified".
Variants and Related Words
  • Uppercase U, Lowercase u: The two forms of the letter.
  • U-bend: A pipe fitting shaped like the letter U.
  • U-turn (n): A turn made by a vehicle to reverse its direction, resembling the shape of the letter U; figuratively, a complete change in plan or opinion.
  • U-shaped (adj): Having a shape similar to the letter U.
Synonyms
  • Uranium (when used as the chemical symbol).
  • Uracil (when used as the biochemical abbreviation).
  • Upper-class (for the adjectival sense).
Related Phrases and Idioms
  • Mind your p's and q's (and u's): An extension of the idiom meaning to be careful about one's behavior or details, humorously including the letter 'u'. (Note: This is a playful, non-standard variant of the common idiom).
u

A student writes the letter u in her notebook.

Adjective
  1. (chiefly British) of or appropriate to the upper classes especially in language use
Noun
  1. the 21st letter of the Roman alphabet
  2. a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
  3. a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

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