Definition of U

noun (n)

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

  Synonym: uracil
  

  source: wordnet30
• a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons (noun.substance)

  Synonym: atomic number 92, uranium
  

  source: wordnet30
• the 21st letter of the Roman alphabet (noun.communication)

  source: wordnet30

adjective satellite (s)

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

  source: wordnet30

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