アイオダイン

(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)

(2)ハロゲンに属す非金属元素

(3)特に医薬と写真撮影において、そして、染料で使われる

(4)自然には（海水や岩石中に）少量の化合物で存在する