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
Look for small cracks and holes, and use sealant caulk to fill the space permanently.
—
Bestreviews, Mercury News, 10 Mar. 2026
As for availability, Kaup said staff contacted 10 local companies that provide sealant services in Lake Forest and found that eight no longer sell coal tar sealant.
—Daniel I. Dorfman, Chicago Tribune, 9 Mar. 2026
How to Remove Stains from Granite Countertops Although your granite may be properly sealed, a sealant is designed to repel stains rather than completely prevent them.
—Caitlin Sole, Better Homes & Gardens, 25 Feb. 2026
Dentistry has long been built on prevention — fluoride, sealants, oral cancer screenings.
—Divya Upadhyay, STAT, 25 Feb. 2026
See All Example Sentences for sealant
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Bestreviews, Mercury News, 10 Mar. 2026
As for availability, Kaup said staff contacted 10 local companies that provide sealant services in Lake Forest and found that eight no longer sell coal tar sealant.
—Daniel I. Dorfman, Chicago Tribune, 9 Mar. 2026
How to Remove Stains from Granite Countertops Although your granite may be properly sealed, a sealant is designed to repel stains rather than completely prevent them.
—Caitlin Sole, Better Homes & Gardens, 25 Feb. 2026
Dentistry has long been built on prevention — fluoride, sealants, oral cancer screenings.
—Divya Upadhyay, STAT, 25 Feb. 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 15 Mar. 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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