Thorium

//ˈθɔːɹiəm// noun

Definitions

Noun
  1. 1
    A chemical element (symbol Th) with atomic number 90. A weakly radioactive, malleable, moderately hard silvery metal that tarnishes black when exposed to air. uncountable, usually
  2. 2
    a soft silvery-white tetravalent radioactive metallic element; isotope 232 is used as a power source in nuclear reactors; occurs in thorite and in monazite sands wordnet

Etymology

From Thor + -ium.

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