Thorium n. (Chem.) A metallic element found in certain rare minerals, as thorite, pyrochlore, monazite, etc., and isolated as an infusible gray metallic powder which burns in the air and forms thoria; formerly called also thorinum. Symbol Th. Atomic weight 232.0.
... vaguely of and rather looked down upon such new-fangled toys as radium and thorium and helium and argon—for the latest astonishing developments in the theory of radio-activity had brought Sir Angus McCurdie his world-wide ... — A Christmas Mystery - The Story of Three Wise Men • William J. Locke
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