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DictionaryuraniumRadioactive metal
noun

uranium

yoo-RAY-nee-uhm/juˈreɪniəm/

A heavy radioactive metallic element used in nuclear fuel and weapons.

The uranium specimen has a silvery exposed face beneath its dull exterior.

A compact, dense-looking uranium metal specimen with a dull oxidized exterior and one freshly exposed silvery-gray face, enclosed in a clear laboratory specimen vessel.
Etymology
uranLatinthe planet Uranus
+iumLatinmetallic element

Uranium was named for the recently discovered planet Uranus. The planet's name honors the Greek god personifying the sky, giving this nuclear fuel a celestial namesake.

In context

Science Studio1:37
element 92, uranium. Forged in exploding stars, it sits on a massive peak of radioactive stability.
Actinides Explained | Complete Guide to the Radioactive Elements | Chemistry Documentary

More examples

  • The reactor used uranium fuel.
  • Scientists measured the uranium content.
  • The ore contained uranium.

Forms

uranium

Similar words

plutonium
A different radioactive element also used in nuclear technology.
thorium
Another radioactive element, with different properties and uses.