Iodine:An element in the diet that isessentialfor the manufacture of hormones by thethyroid gland. Thethyroidglandusesiodineto makethyroxine(T4), which has four iodine molecules attached to its structure, and triiodothyronine (T3), which has three iodine molecules attached. Iodine is found in seafood, bread, iodized salt, and seaweed.
