Iron refers to a silvery-white, lustrous, magnetic or magnetisable metallic element. The term could also mean great hardness or strength. As a verb, iron means to smooth clothes by removing creases using a heated iron.
2 Additional Answers
Iron has several different meanings depending upon how you are using the word. It is a golf club, a metallic element, a way to press clothing, and a component of hemoglobin in your blood.
Iron means a heavy metallic metal element. It is silvery white in color and rusts easy. It also transports oxygen by blood. A gulf club and a brander to brand cattle are also irons. You can find more information here: http://www.audioenglish.net/dictionary/iron.htm