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
Washing hair regularly creates a cuticular barrier, or sealant, that is more effective in protecting the hair.
—
Cory Martin, Verywell Health, 2 Apr. 2026
Apply a sealant to the sidewalk, if desired, to prevent future staining.
—Karen Brewer Grossman, Southern Living, 13 Mar. 2026
This versatile sealant works inside and outside to cover gaps and holes where mice may enter.
—Bestreviews, Mercury News, 10 Mar. 2026
The Lake Forest City Council has taken the first step toward banning coal tar sealant, a pavement product that contains compounds known to cause cancer.
—Daniel I. Dorfman, Chicago Tribune, 9 Mar. 2026
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Cory Martin, Verywell Health, 2 Apr. 2026
Apply a sealant to the sidewalk, if desired, to prevent future staining.
—Karen Brewer Grossman, Southern Living, 13 Mar. 2026
This versatile sealant works inside and outside to cover gaps and holes where mice may enter.
—Bestreviews, Mercury News, 10 Mar. 2026
The Lake Forest City Council has taken the first step toward banning coal tar sealant, a pavement product that contains compounds known to cause cancer.
—Daniel I. Dorfman, Chicago Tribune, 9 Mar. 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 8 Apr. 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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