English dictionary
thorium
/'/T//oU/r/i//@/m/
Definitions, examples, synonyms and antonyms from WordNet 3.0.
noun
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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
Source: WordNet 3.0
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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 <i>thorinum</i>. Symbol Th. Atomic weight 232.0.
Source: webster1913