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1. (n.) thorium
a grayish white, lustrous, radioactive metallic element: used as a source of nuclear energy, in sun-lamp and vacuum-tube filaments, and in alloys.
Etymology: (< Sw (1829); see Thor , -ium2)
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| Definition of 'Thorium' |
Princeton's WordNet |
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1. (noun) thorium, Th, atomic number 90
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
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Webster Dictionary |
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1. (noun) Thorium
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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| Definition of 'Thorium' |
U.S. National Library of Medicine |
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1. Thorium
Thorium. A radioactive element of the actinide series of metals. It has an atomic symbol Th, atomic number 90, and atomic weight 232.04. It is used as fuel in nuclear reactors to produce fissionable uranium isotopes. Because of its radioopacity, various thorium compounds are used to facilitate visualization in roentgenography.
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Definitions of Thorium 
