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
Additionally, their cores can (usually) be removed, allowing sealant to be injected through them into tubeless tires.
—
New Atlas, 5 June 2026
Consider sanding and staining the wood, or at least providing a sealant, to help protect against the elements.
—Wendy Rose Gould, Martha Stewart, 3 June 2026
Benefits of Staining a Deck Wooden decks require some type of protective paint, stain, or sealant to remain in good condition for years to come.
—Timothy Dale, The Spruce, 2 June 2026
Its solution has involved stuffing pieces of solid foam into the gaps and then adding a sealant compound on top.
—New York Times, 31 May 2026
See All Example Sentences for sealant
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New Atlas, 5 June 2026
Consider sanding and staining the wood, or at least providing a sealant, to help protect against the elements.
—Wendy Rose Gould, Martha Stewart, 3 June 2026
Benefits of Staining a Deck Wooden decks require some type of protective paint, stain, or sealant to remain in good condition for years to come.
—Timothy Dale, The Spruce, 2 June 2026
Its solution has involved stuffing pieces of solid foam into the gaps and then adding a sealant compound on top.
—New York Times, 31 May 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 9 Jun. 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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