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
For a discreet look, Garvey recommends using a beige high-performance silicone sealant on warm-toned tile.
—
Maria Sabella, Better Homes & Gardens, 22 Feb. 2025
The river’s mud, which lacks oxygen, is a sealant that helps preserve remains.
—Alexander Nazaryan, New York Times, 21 Feb. 2025
It might even, conceivably, be configured to act as a sealant – much like that used in military aircraft fuel tanks.
—David Szondy, New Atlas, 11 Feb. 2025
But don't worry, this can easily be fixed by applying a duct sealant to stop the leak.
—Ashlyn Needham, Southern Living, 19 Jan. 2025
See All Example Sentences for sealant
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Maria Sabella, Better Homes & Gardens, 22 Feb. 2025
The river’s mud, which lacks oxygen, is a sealant that helps preserve remains.
—Alexander Nazaryan, New York Times, 21 Feb. 2025
It might even, conceivably, be configured to act as a sealant – much like that used in military aircraft fuel tanks.
—David Szondy, New Atlas, 11 Feb. 2025
But don't worry, this can easily be fixed by applying a duct sealant to stop the leak.
—Ashlyn Needham, Southern Living, 19 Jan. 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 3 Mar. 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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