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u Definition
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u
noun()a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
Synonyms: uracil,
u
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,
u
adjective()(chiefly British) of or appropriate to the upper classes especially in language use
u
noun()the 21st letter of the Roman alphabet