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
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
This is achieved through gaskets sealing the segment joints and a 3-inch-thick layer of grout sealant.
—Hadley Hitson, Nashville Tennessean, 29 Sep. 2025
Caulking is a mold magnet even though its purpose is to be a moisture sealant.
—Mary Cornetta, Better Homes & Gardens, 23 Sep. 2025
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
See All Example Sentences for sealant
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Ashlyn Needham, Southern Living, 10 Oct. 2025
This is achieved through gaskets sealing the segment joints and a 3-inch-thick layer of grout sealant.
—Hadley Hitson, Nashville Tennessean, 29 Sep. 2025
Caulking is a mold magnet even though its purpose is to be a moisture sealant.
—Mary Cornetta, Better Homes & Gardens, 23 Sep. 2025
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
See All Example Sentences for sealant
Cite this Entry
“Sealant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sealant. Accessed 31 Oct. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share