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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Founded in 1887 and headquartered in suburban Vadnais Heights, H.B. Fuller is a manufacturer and provider of adhesives, sealants and specialty chemical products.
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Mars King, Twin Cities, 28 July 2025
Components that fit together like Lego bricks – instead of using glue – or dissolvable sealants and adhesives could be parts of these designs.
—Anurag Srivastava, The Conversation, 10 July 2025
Steam can remove sealants and penetrate the porous stone, which could result in discoloration or cracking.
—Brandee Gruener, Southern Living, 10 May 2025
On a Drive In cars, formaldehyde adhesives can be found in the dashboards, seat coverings, flooring materials, carpeting, door trim, window sealant and armrests.
—Topher Sanders, ProPublica, 9 Dec. 2024
See All Example Sentences for sealant
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Mars King, Twin Cities, 28 July 2025
Components that fit together like Lego bricks – instead of using glue – or dissolvable sealants and adhesives could be parts of these designs.
—Anurag Srivastava, The Conversation, 10 July 2025
Steam can remove sealants and penetrate the porous stone, which could result in discoloration or cracking.
—Brandee Gruener, Southern Living, 10 May 2025
On a Drive In cars, formaldehyde adhesives can be found in the dashboards, seat coverings, flooring materials, carpeting, door trim, window sealant and armrests.
—Topher Sanders, ProPublica, 9 Dec. 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 3 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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