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thorinum

Source : Webster's Revised Unabridged Dictionary (1913)

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.
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