iodine iodine /ˈaɪəˌdaɪn/

noun

1. () 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)  ( atomic number 53 , I , iodin , iodine )
   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)
     Iodine is an essential element for the production of thyroid hormones.
   Iodine is an essential element for the production of thyroid hormones.
   
   
2. A tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic  ( iodine , tincture of iodine )
   a tincture consisting of a solution of iodine in ethyl alcohol; applied topically to wounds as an antiseptic