Sentence:  ( 1 ) When an object was placed in the patient 's hand , he had no difficulty determining whether it was warm or cold , sharp or blunt , rough or smooth , flexible , soft , or hard ; and he could tell , simply by the feel of it , whether it was made of wood , <WSD>iron</WSD> , cloth , rubber , and so on . 
Meaning of the word marked with <WSD> tags:  a heavy ductile magnetic metallic element; is silver-white in pure form but readily rusts; used in construction and tools and armament; plays a role in the transport of oxygen by the blood