Thesaurus: thorium

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Definitions

1. n. 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.
2. 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
3. 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.
4. A metallic element found in certain rare minerals, as thorite,pyrochlore, monazite, etc., and isolated as an infusible graymetallic powder which burns in the air and forms thoria; -- formerlycalled also thorinum. Symbol Th. Atomic weight 232.0.
5. n:100 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