Source : Webster's Revised Unabridged Dictionary (1913)

Ironwork \I"ron*work`\, n.
   Anything made of iron; -- a general name of such parts or
   pieces of a building, vessel, carriage, etc., as consist of
   iron.

Source : WordNet®

ironwork
     n : work made of iron (gratings or rails or railings etc); "the
         houses had much ornamental ironwork"