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
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
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, 28 Nov. 2025
Its main purpose is to act as a sealant to keep water from getting behind the tiles to cause mold or mildew to develop in the wall.
—Ashlyn Needham, Southern Living, 10 Oct. 2025
See All Example Sentences for sealant
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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
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, 28 Nov. 2025
Its main purpose is to act as a sealant to keep water from getting behind the tiles to cause mold or mildew to develop in the wall.
—Ashlyn Needham, Southern Living, 10 Oct. 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 6 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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