i ‧ o ‧ dine /ˈaɪədiːn $ -daɪn/ BrE AmE noun [uncountable]
[ Date: 1800-1900 ; Language: French ; Origin: iode , from Greek ion 'dark bluish-red' ]
a dark blue chemical substance that is used on wounds to prevent infection. It is a chemical ↑ element : symbol I