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
Chicago police said during at least five incidents, a group enters the businesses by removing sealant molding to extract window panes and glass door insers.
—
Elyssa Kaufman, CBS News, 20 June 2026
Photos published by Getty Images on June 18 show a tear in the sealant.
—Jeanine Santucci, USA Today, 20 June 2026
The wax and sealant not only restores your chrome wheels’ glossy shine but also protects them by actively repelling brake dust, road salt and other debris.
—Bestreviews, Chicago Tribune, 16 June 2026
The problem has been ongoing since 2019, and Russian astronauts have been attempting various fixes, often using a sealant called Germetall-1.
—Eric Berger, ArsTechnica, 15 June 2026
See All Example Sentences for sealant
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Elyssa Kaufman, CBS News, 20 June 2026
Photos published by Getty Images on June 18 show a tear in the sealant.
—Jeanine Santucci, USA Today, 20 June 2026
The wax and sealant not only restores your chrome wheels’ glossy shine but also protects them by actively repelling brake dust, road salt and other debris.
—Bestreviews, Chicago Tribune, 16 June 2026
The problem has been ongoing since 2019, and Russian astronauts have been attempting various fixes, often using a sealant called Germetall-1.
—Eric Berger, ArsTechnica, 15 June 2026
See All Example Sentences for sealant
Cite this Entry
“Sealant.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/sealant. Accessed 23 Jun. 2026.
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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