U

English Dictionary -> Letter U -> U

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U Definition

• (n) a nitrogen-containing base found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
• (n) a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
• (n) the 21st letter of the Roman alphabet
• (s) (chiefly British) of or appropriate to the upper classes especially in language use

U Synonyms

• atomic number 92
• U
• uracil
• uranium