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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
WordNet 2.1 Copyright Princeton University. All rights reserved.
