| NOUN | substance | cobalt 60 | a radioactive isotope of cobalt with mass number 60 |
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| Meaning | A radioactive isotope of cobalt with mass number 60; a source of exceptionally intense gamma rays; used in radiation therapy. | |
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| Broader | cobalt, Co, atomic number 27 | A hard ferromagnetic silver-white bivalent or trivalent metallic element |
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