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Definitions of u
  1. noun
    a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

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  2. noun
    a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
  3. adjective
    (chiefly British) of or appropriate to the upper classes especially in language use

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  4. noun
    the 21st letter of the Roman alphabet
Explanation of u
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