| NOUN | substance | strontium 90 | a radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions |
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| Meaning | A radioactive isotope of strontium (with the mass number 90) that is present in the fallout from nuclear explosions; can be assimilated like calcium into bones. | |
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| Broader | strontium, Sr, atomic number 38 | A soft silver-white or yellowish metallic element of the alkali metal group |
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