iron age; iron blue; iron boot; iron cage; iron carbide; iron chancellor; iron collar; iron curtain; iron deficiency anaemia; iron deficiency anemia; iron disulfide; iron duke; iron filing; iron fist; iron foundry; iron heel; iron horse; iron lady; iron lung; iron maiden; iron man; iron manganese tungsten; iron mold; iron mould; iron oak; iron ore; iron out; iron overload; iron perchloride; iron putty; iron pyrite; iron trap; iron tree; iron-gray; iron-grey; iron-storage disease; iron-tree;