Definition of "Iron" :

noun: home appliance consisting of a flat metal base that is heated and used to smooth cloth

noun: a golf club that has a relatively narrow metal head

noun: implement used to brand live stock

noun: 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

verb: press and smooth with a heated iron

"She stood there ironing."

adjective: extremely robust

"An iron constitution."