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



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