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The Adobe Flash Player is required in order to view this content. You can get it here: thoriumOne entry found. Main Entry: tho·ri·um Pronunciation: \ˈthȯr-ē-əm\ Function: noun Etymology: New Latin, from Old Norse Thōrr Thor Date: 1832 : a radioactive metallic element that is obtained especially from monazite and is usually associated with rare earths — see element table 
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