1. (

• iodine ,
• iodin ,
• I ,
• atomic_number_ ,

) 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) ;

2. (

• tincture_of_iodine ,
• iodine

) a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic ;