Iron  —n. 1 grey metallic element used for tools and constructions and found in some foods, e.g. Spinach. 2 this as a symbol of strength or firmness (man of iron; iron will). 3 tool made of iron. 4 implement with a flat base which is heated to smooth clothes etc. 5 golf club with an iron or steel sloping face. 6 (usu. In pl.) Fetter. 7 (usu. In pl.) Stirrup. 8 (often in pl.) Iron support for a malformed leg. —adj. 1 made of iron. 2 very robust. 3 unyielding, merciless. —v. Smooth (clothes etc.) With an iron.  iron out remove (difficulties etc.). [old english]