Meaning : A base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine. Pairs with adenine.
Synonyms : uracil
Meaning : A heavy toxic silvery-white radioactive metallic element. Occurs in many isotopes. Used for nuclear fuels and nuclear weapons.
Synonyms : atomic number 92, uranium
Meaning : The 21st letter of the Roman alphabet.
Meaning : (chiefly British) of or appropriate to the upper classes especially in language use.