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 u u /ˈjuː/

adjective

  1. [Informal, British] (chiefly British) of or appropriate to the upper classes especially in language use  ( u [Informal, British] )
    (chiefly British) of or appropriate to the upper classes especially in language use

 U

    noun

    1. The 21st letter of the Roman alphabet  ( U )
      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  ( atomic number 92 , U , uranium )
      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  ( U , uracil )
      a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine