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U is the dictionary form of U'S Definition of U
U has definitions from the fields of chemistry,physics,biology,biochemistry |
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[ adjective ] (chiefly British) of or appropriate to the upper classes especially in language use
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[ noun ] (biology,chemistry,biochemistry) a nitrogen-containing base found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
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[ noun ] the 21st letter of the Roman alphabet
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[ noun ] (chemistry,physics) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
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