noun
a highly radioactive metallic element found in small amounts in uranium ores, used in the treatment of cancer and in luminous paints
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The discovery of radium by Marie Curie was a groundbreaking achievement in the field of chemistry.
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Did you know radium was used in glow-in-the-dark paint back in the day?
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That party was lit, they must have added some radium to the drinks!
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Her smile was so bright and infectious, it was like she was emitting radium.