u

This word does not have a syllable breakdown in our dictionary yet, so pronunciation and parts are not shown.

noun. A base containing nitrogen that is found in RNA (but not in DNA) and derived from pyrimidine; pairs with adenine.

noun. A heavy toxic silvery-white radioactive metallic element; occurs in many isotopes; used for nuclear fuels and nuclear weapons.

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

noun. The 21st letter of the Roman alphabet.