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English Dictionary

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 U U

noun

  • the 21st letter of the Roman alphabet  ( U )
    the 21st letter of the Roman alphabet
  • a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons  ( atomic number 92, U, uranium )
    a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
  • a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine  ( U, uracil )
    a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
  • adj

  • (chiefly British) of or appropriate to the upper classes especially in language use  ( u )
    (chiefly British) of or appropriate to the upper classes especially in language use