caulk

Noun
  1. A waterproof filler and sealant that is used in building and repair to make watertight (synset 115039263)
    is a type of: sealant, sealer - a kind of sealing material that is used to form a hard coating on a porous surface (as a coat of paint or varnish used to size a surface)
    same as: caulking
Verb
  1. Seal with caulking (synset 201357268)
    "caulk the window"
    is a type of: seal, seal off - make tight; secure against leakage
    same as: calk

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