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Open English Wordnet
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Nouns
(n)
uracil
,
U
a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
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(n)
uranium
,
U
,
atomic number 92
a heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons
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(n)
U
,
u
the 21st letter of the Roman alphabet
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