thorium - definition and synonyms

noun [uncountable] chemistry 

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  1.   From our crowdsourced Open Dictionary
    a radioactive element, which some countries are planning to use as a source of nuclear power because it is considered to be safer than uranium

    Officials are currently selecting a site for the reactor, which would be the first of its kind, using thorium for the bulk of its fuel instead of uranium – the fuel for conventional reactors.

    Submitted from United Kingdom on 02/11/2011