1 definition found From The Collaborative International Dictionary of English v.0.48 [gcide]: Thorium \Tho"ri*um\, n. [NL. See {Thorite}.] (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. [1913 Webster]
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