iron
     adj : extremely robust; "an iron constitution" [syn: {cast-iron}]
     n 1: 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 [syn: {Fe}, {atomic number 26}]
     2: a golf club that has a relatively narrow metal head
     3: metal shackles; for hands or legs [syn: {irons}, {chain}, {chains}]
     4: implement used to brand live stock [syn: {branding iron}]
     5: home appliance consisting of a flat metal base that is
        heated and used to smooth cloth [syn: {smoothing iron}]
     v : press and smooth with a heated iron; "press your shirts"
         [syn: {iron out}]
Source: WordNet® 2.0

iron n. Hardware, especially older and larger hardware of {mainframe}
   class with big metal cabinets housing relatively low-density electronics
   (but the term is also used of modern supercomputers). Often in the
   phrase {big iron}. Oppose {silicon}. See also {dinosaur}.


Source: The Jargon File