- 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. Source: opted
- 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 Source: wordnet
- 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. Source: webster
- 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. Source: adambom
- 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 Source: ecdict
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