Definition of 'u'

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Definitions of 'u'

1. (noun) uracil, U
a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine

2. (noun) uranium, U, atomic number 92
a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons

3. (adj) U, u
the 21st letter of the Roman alphabet

4. (adj) u
(chiefly British) of or appropriate to the upper classes especially in language use

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