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- Hyphenation: ura‧ni‧um
- (uncountable) Uranium is an element of the periodic table with atomic number 92. Its symbol is U.
- Uranium is the natural element with the biggest atomic core.
- (uncountable) Uranium is also the radioactive metal made of uranium atoms.
- Uranium has been increasingly used since the last six decades, its radioactive properties have found both military and civil uses.