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Definition of thorium noun from the Oxford Advanced Learner's Dictionary

 

thorium

 noun
noun
BrE BrE//ˈθɔːriəm//
 
; NAmE NAmE//ˈθɔːriəm//
 
[uncountable] (symbol Th)
 
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a chemical element. Thorium is a white radioactive metal used as a source of nuclear energy. Word Origin mid 19th cent.: named after Thor (the Greek god of thunder, the weather, agriculture and the home).
See the Oxford Advanced American Dictionary entry: thorium