URANIUM Meaning of URANIUM in English [ jʊ'reɪnɪəm ]■ noun the chemical element of atomic number 92, a grey dense radioactive metal used as a fuel in nuclear reactors. (Symbol: U )OriginC18: mod. L., from Uranus . Concise Oxford English vocab. Сжатый оксфордский словарь английского языка. 2004