DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   siding
       n 1: a short stretch of railroad track used to store rolling
            stock or enable trains on the same line to pass [syn:
            siding, railroad siding, turnout, sidetrack]
       2: material applied to the outside of a building to make it
          weatherproof