DuckCorp Dico

Found one definition

1.                 From The Collaborative International Dictionary of English v.0.48:
                   
   
   
                   
                     
   Cobblestone \Cob"ble*stone`\, n.
      A large pebble; a rounded stone not too large to be handled;
      a small boulder; -- used for paving streets and for other
      purposes.
      [1913 Webster]