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
Seal around electrical cables and vent pipes with a fire-stop sealant.
—
Sarah Moore, Freep.com, 12 Dec. 2025
Its acidity can wear down the sealant, dull or etch the surface, damage the resin that binds quartz surfaces, and make the counters more prone to staining.
—Karen Brewer Grossman, Southern Living, 5 Dec. 2025
The investigation has raised concerns about bamboo scaffolding, renovation netting, foam sealant used around windows and elevators, and faulty fire alarms, with authorities examining several possible fire-code violations.
—Mandy Taheri, MSNBC Newsweek, 30 Nov. 2025
In California, dental assistant can do some tasks with training and without a license, while other tasks, such as applying sealants, require a license.
—Roxana Popescu, San Diego Union-Tribune, 30 Nov. 2025
See All Example Sentences for sealant
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Sarah Moore, Freep.com, 12 Dec. 2025
Its acidity can wear down the sealant, dull or etch the surface, damage the resin that binds quartz surfaces, and make the counters more prone to staining.
—Karen Brewer Grossman, Southern Living, 5 Dec. 2025
The investigation has raised concerns about bamboo scaffolding, renovation netting, foam sealant used around windows and elevators, and faulty fire alarms, with authorities examining several possible fire-code violations.
—Mandy Taheri, MSNBC Newsweek, 30 Nov. 2025
In California, dental assistant can do some tasks with training and without a license, while other tasks, such as applying sealants, require a license.
—Roxana Popescu, San Diego Union-Tribune, 30 Nov. 2025
See All Example Sentences for sealant
Cite this Entry
“Sealant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sealant. Accessed 16 Dec. 2025.
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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