DuckCorp Dico

Found one definition

1.                 From WordNet (r) 3.0 (2006):
                   
   
   
                   
                     
   caulk
       n 1: a waterproof filler and sealant that is used in building
            and repair to make watertight [syn: caulk, caulking]
       v 1: seal with caulking; "caulk the window" [syn: caulk,
            calk]