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Thorium
//ˈθɔːɹiəm// noun
Definitions
Noun
- 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 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.
See also for "thorium"
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