| NOUN | substance | atomic number 53, iodine, iodin, I | a nonmetallic element belonging to the halogens |
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| Meaning | A nonmetallic element belonging to the halogens; used especially in medicine and photography and in dyes; occurs naturally only in combination in small quantities (as in sea water or rocks). | |
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| Synonyms | iodine, iodin, I | |
| Narrower | iodine-125 | light radioactive isotope of iodine with a half-life of 60 days |
| iodine-131 | Heavy radioactive isotope of iodine with a half-life of 8 days | |
| Broader | chemical element, element | Any of the more than 100 known substances (of which 92 occur naturally) that cannot be separated into simpler substances and that singly or in combination constitute all matter |
| halogen | Any of five related nonmetallic elements (fluorine or chlorine or bromine or iodine or astatine) that are all monovalent and readily form negative ions | |
| Substance of | seawater, saltwater, brine | water containing salts |
| Spanish | iodo, número atómico 53, yodo | |
| Catalan | iode, número atòmic 53 | |
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