Hypertext Webster Gateway: "thorium"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
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.
From WordNet (r) 1.7 (wn)
thorium
n : a soft silvery-white tetravalent radioactive metallic
element; isotope 232 is used as a power source in nuclear
reactors; occurs in thorite and in monazite sands [syn: {Th},
{atomic number 90}]
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