DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   Ir
       n 1: a heavy brittle metallic element of the platinum group;
            used in alloys; occurs in natural alloys with platinum or
            osmium [syn: iridium, Ir, atomic number 77]
       2: a board of the British government that administers and
          collects major direct taxes [syn: Inland Revenue, IR]