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| ra·di·um [ ráydee əm ] |
noun |
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| Definition: |
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white radioactive element: a white highly radioactive metallic element. Source: pitchblende, carnotite. Use: luminous coatings, treatment of cancer.
Symbol Ra
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| [Late 19th century. < Latin radius "staff, spoke, ray, beam of light"; from the rays emitted by radium, which penetrate specific opaque materials] |
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