1. (noun) uracil, U
a base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine
Synonyms: atomic number 92, uranium, uracil
Antonyms: low-class, lower-class, middle-class
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
Synonyms: atomic number 92, uranium, uracil
Antonyms: middle-class, low-class, lower-class
3. (adj) U, u
the 21st letter of the Roman alphabet
Synonyms: atomic number 92, uranium, uracil
Antonyms: low-class, middle-class, lower-class
4. (adj) u
(chiefly British) of or appropriate to the upper classes especially in language use
Antonyms: middle-class, low-class, lower-class
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Synonyms and Antonyms of u 
