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
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Also among the evidence found at the scene, per FOX 56, was also a to-do list, allegedly written by Kearney, that included reminders to clean up, get rid of evidence, paint things in the home with an odor sealant and dispose of Poole's body.
—
Charlotte Phillipp, People.com, 15 Sep. 2025
Then, apply a layer of weatherproof sealant around pipes and cables to lock it in place.
—Elizabeth Fogarty, Better Homes & Gardens, 11 Sep. 2025
This will avoid causing damage to the sealant and potential staining.
—Patricia Shannon, Southern Living, 9 Sep. 2025
Each pair is slightly different thanks to the grain of the material and is finished with a water‑resistant sealant for all-weather durability.
—New Atlas, 28 Aug. 2025
See All Example Sentences for sealant
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Charlotte Phillipp, People.com, 15 Sep. 2025
Then, apply a layer of weatherproof sealant around pipes and cables to lock it in place.
—Elizabeth Fogarty, Better Homes & Gardens, 11 Sep. 2025
This will avoid causing damage to the sealant and potential staining.
—Patricia Shannon, Southern Living, 9 Sep. 2025
Each pair is slightly different thanks to the grain of the material and is finished with a water‑resistant sealant for all-weather durability.
—New Atlas, 28 Aug. 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 Sep. 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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