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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Hydrogen peroxide can etch or break down the sealant used on these surfaces, potentially reacting with the stone and causing discoloration or a dull, cloudy appearance.
—
Karen Brewer Grossman, Southern Living, 4 Aug. 2025
The only con to using a cabinet or bookshelf is that it will be exposed to the elements, so make sure to coat the cabinet in a water-resistant sealant to avoid rain damage.
—Claire Hoppe Norgaard, Better Homes & Gardens, 1 July 2025
Ask your dentist about sealants and fluoride varnish.
—Olga Ensz, The Conversation, 30 June 2025
Founded in 1887 and headquartered in suburban Vadnais Heights, H.B. Fuller is a manufacturer and provider of adhesives, sealants and specialty chemical products.
—Mars King, Twin Cities, 28 July 2025
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Karen Brewer Grossman, Southern Living, 4 Aug. 2025
The only con to using a cabinet or bookshelf is that it will be exposed to the elements, so make sure to coat the cabinet in a water-resistant sealant to avoid rain damage.
—Claire Hoppe Norgaard, Better Homes & Gardens, 1 July 2025
Ask your dentist about sealants and fluoride varnish.
—Olga Ensz, The Conversation, 30 June 2025
Founded in 1887 and headquartered in suburban Vadnais Heights, H.B. Fuller is a manufacturer and provider of adhesives, sealants and specialty chemical products.
—Mars King, Twin Cities, 28 July 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 19 Aug. 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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