Definitions of sealant
  1. noun
    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)
    synonyms: sealer
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    caulk, caulking
    a waterproof filler and sealant that is used in building and repair to make watertight
    type of:
    sealing material
    any substance used to seal joints or fill cracks in a porous surface
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