Definition - u

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u
  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 nitrogen-containing base found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
  4. (chiefly British) of or appropriate to the upper classes especially in language use
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