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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And even roofs that are still relatively young may begin to show signs of weakness — the sealant that holds asphalt shingles in place often begins to degrade after a decade and can fail when pummeled with high winds.
—
Ron Lieber, New York Times, 19 Mar. 2025
The sealant prevented any poison from seeping into her own skin.
—Maureen Lee Lenker, EW.com, 20 Feb. 2025
If there’s a slightly noisier spot (or spots) in the apartment, that is another indicator of gaps that might allow smells to seep in and could benefit from sealant, says Arianna Deane, an architect and A+A+A cofounder.
—Diana Budds, Architectural Digest, 16 Jan. 2025
Type of Sealant In most cases, a wood floor has a protective sealant to prevent damage from UV radiation, moisture, and regular wear.
—Timothy Dale, Better Homes & Gardens, 6 Sep. 2024
See All Example Sentences for sealant
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Ron Lieber, New York Times, 19 Mar. 2025
The sealant prevented any poison from seeping into her own skin.
—Maureen Lee Lenker, EW.com, 20 Feb. 2025
If there’s a slightly noisier spot (or spots) in the apartment, that is another indicator of gaps that might allow smells to seep in and could benefit from sealant, says Arianna Deane, an architect and A+A+A cofounder.
—Diana Budds, Architectural Digest, 16 Jan. 2025
Type of Sealant In most cases, a wood floor has a protective sealant to prevent damage from UV radiation, moisture, and regular wear.
—Timothy Dale, Better Homes & Gardens, 6 Sep. 2024
See All Example Sentences for sealant
Cite this Entry
“Sealant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sealant. Accessed 24 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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