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
But don't worry, this can easily be fixed by applying a duct sealant to stop the leak.
—
Ashlyn Needham, Southern Living, 27 Dec. 2025
Genie offers three wash levels with options for waxes, sealants, wheel cleaning, tire dressing, and high-pressure rinses that are provided in state-of-the-art wash tunnels.
—Susan Gill Vardon, San Diego Union-Tribune, 22 Dec. 2025
Once collected, used some sort of sealant like clay, or glue the items onto a piece of cut-out or natural wood.
—Emilee Coblentz, Outside, 14 Dec. 2025
Seal around electrical cables and vent pipes with a fire-stop sealant.
—Sarah Moore, Freep.com, 12 Dec. 2025
See All Example Sentences for sealant
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Ashlyn Needham, Southern Living, 27 Dec. 2025
Genie offers three wash levels with options for waxes, sealants, wheel cleaning, tire dressing, and high-pressure rinses that are provided in state-of-the-art wash tunnels.
—Susan Gill Vardon, San Diego Union-Tribune, 22 Dec. 2025
Once collected, used some sort of sealant like clay, or glue the items onto a piece of cut-out or natural wood.
—Emilee Coblentz, Outside, 14 Dec. 2025
Seal around electrical cables and vent pipes with a fire-stop sealant.
—Sarah Moore, Freep.com, 12 Dec. 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 Dec. 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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