DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   obstacle
       n 1: something immaterial that stands in the way and must be
            circumvented or surmounted; "lack of imagination is an
            obstacle to one's advancement"; "the poverty of a district
            is an obstacle to good education"; "the filibuster was a
            major obstruction to the success of their plan" [syn:
            obstacle, obstruction]
       2: an obstruction that stands in the way (and must be removed or
          surmounted or circumvented)