iodine /ˈaɪ.əˌdaɪnnoun 3verb 1forms 3 noun3 •A chemical element (symbol: I) with an atomic number of 53; one of the halogens. •An antiseptic incorporating the element. •(no longer used) An iodide. verb1 •to treat with iodine. formsiodined · iodining · iodines
