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Definition of Thorium
1. Noun. 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.
Generic synonyms: Metal, Metallic Element
Specialized synonyms: Radiothorium, Thorium-228
Substance meronyms: Monazite, Thorite
Derivative terms: Thoriate
Definition of Thorium
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.
Definition of Thorium
1. a metallic element [n -S]
Medical Definition of Thorium
1.