| NOUN | substance | iodine-125 | light radioactive isotope of iodine with a half-life of 60 days |
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| Meaning | light radioactive isotope of iodine with a half-life of 60 days; used as a tracer in thyroid studies and as a treatment for hyperthyroidism. | |
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| Broader | iodine, iodin, I, atomic number 53 | A nonmetallic element belonging to the halogens |
| radioisotope | A radioactive isotope of an element | |
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