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ra·di·um
 radium
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- pronunciation:
- reI
di
 m
- features:
- Word Combinations (noun), Word Explorer, Word Parts
| part of speech: |
noun |
| definition: |
a radioactive chemical element that has eighty-eight protons in each nucleus and that occurs in pure form as a solid metal, used esp. as a radiation source for cancer treatment. (symbol: Ra)
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