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radium

noun
🔊/ˈreɪdiəm/
🔊/ˈreɪdiəm/
 [uncountable]
(symbol Ra)
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  1. a chemical element. Radium is a white radioactive metal used in the treatment of diseases such as cancer.镭Topics Physics and chemistryc2
    Word Originlate 19th cent.: from Latin radius ‘ray’ + -ium.