1
: a sealing agent
a radiator sealant
2
: a plastic material applied to parts of teeth with imperfections (such as pits and fissures) to prevent dental decay
Examples of sealant in a Sentence
Recent Examples on the Web
Reapply your grout's sealant once or twice a year is another maintenance trick for keeping it cleaner since this protects the grout from moisture exposure.
—
Ashlyn Needham, Southern Living, 2 May 2026
If pruning is unavoidable at that time, apply a commercial pruning sealant or latex paint to wounds so beetles that spread oak wilt disease are not drawn to the fresh cuts.
—Luke Miller, Better Homes & Gardens, 1 May 2026
Molded concrete meets a watertight sealant and a beautiful clay veneer to make an accent table worthy of your best cocktail—suddenly concrete feels less like a brutalist statement and more like something pulled from the earth.
—Julia Harrison, Architectural Digest, 29 Apr. 2026
Typically, when the deck is first, built the final part of the process is applying a sealant that will create a protective barrier to safeguard the wood.
—Timothy Dale, The Spruce, 24 Apr. 2026
See All Example Sentences for sealant
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Ashlyn Needham, Southern Living, 2 May 2026
If pruning is unavoidable at that time, apply a commercial pruning sealant or latex paint to wounds so beetles that spread oak wilt disease are not drawn to the fresh cuts.
—Luke Miller, Better Homes & Gardens, 1 May 2026
Molded concrete meets a watertight sealant and a beautiful clay veneer to make an accent table worthy of your best cocktail—suddenly concrete feels less like a brutalist statement and more like something pulled from the earth.
—Julia Harrison, Architectural Digest, 29 Apr. 2026
Typically, when the deck is first, built the final part of the process is applying a sealant that will create a protective barrier to safeguard the wood.
—Timothy Dale, The Spruce, 24 Apr. 2026
See All Example Sentences for sealant
Cite this Entry
“Sealant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sealant. Accessed 4 May. 2026.
Copy CitationMedical Definition
sealant
noun
seal·ant
ˈsē-lənt 
: a plastic material that is applied to parts of teeth (as the occlusal surfaces of molars and premolars) with imperfections (as pits and fissures) usually to prevent dental decay
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