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Dictionary definition for: U

1. (n) a nitrogen-containing base found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

2. (s) (chiefly British) of or appropriate to the upper classes especially in language use

3. (n) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

4. (n) the 21st letter of the Roman alphabet

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