DictionarycaulkGap sealant
noun / verb

caulk

KAWK/kɔːk/

A filler used to seal gaps against air or water, or to apply it.

She applies caulk along the sink seam.

Caulking a sink seam.
Etymology

The lime root supplied a verb meaning to fill cracks with lime. English applied the idea to making ships watertight by packing oakum into seams, retaining the sealing action rather than the original material.

In context

Reluctant DIYers0:32
we want to caulk our tub think inside corners when we caulk first the most obvious around the top of the tub right where the wall meets the top of the tub
How to Caulk a Bathtub - Caulking Tips

More examples

  • She caulked around the window frame.
  • The old caulk had cracked.
  • The crew is caulking the joints against water.

Forms

caulk · caulks · caulked · caulking

caulking noun — material used to seal gaps

Similar words

sealant
Sealant is the broad category; caulk is a filler commonly applied along gaps and joints.
grout
Grout fills spaces between tiles or masonry; caulk is usually more flexible and seals joints.