SynonymDefinitionAntonym.com - English Synonym Dictionary

The 21st letter of the Roman alphabet

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

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

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