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    u - Dictionary definition and meaning for word u

    (noun) a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
    Synonyms : uracil
    (noun) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
    Synonyms : atomic number 92 , uranium
    (noun) the 21st letter of the Roman alphabet Definition
    (adj) (chiefly British) of or appropriate to the upper classes especially in language use
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