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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Each pair is slightly different thanks to the grain of the material and is finished with a water‑resistant sealant for all-weather durability.
—
New Atlas, 28 Aug. 2025
Use sealant or expanding foam to fill in gaps where pipes or wires enter the home.
—Arricca Elin Sansone, Southern Living, 23 Aug. 2025
The project will consist of replacing caulking and joint sealants on the top four levels of the garage to prevent water from leaking through to the lower levels, which contributes to the deterioration of the parking structure, the release said.
—Michelle Mullins, Chicago Tribune, 21 Aug. 2025
Explore your options in types of wood, stains and sealants, and contractors and their reviews.
—Neil Sperry, Fort Worth Star-Telegram, 8 Aug. 2025
See All Example Sentences for sealant
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New Atlas, 28 Aug. 2025
Use sealant or expanding foam to fill in gaps where pipes or wires enter the home.
—Arricca Elin Sansone, Southern Living, 23 Aug. 2025
The project will consist of replacing caulking and joint sealants on the top four levels of the garage to prevent water from leaking through to the lower levels, which contributes to the deterioration of the parking structure, the release said.
—Michelle Mullins, Chicago Tribune, 21 Aug. 2025
Explore your options in types of wood, stains and sealants, and contractors and their reviews.
—Neil Sperry, Fort Worth Star-Telegram, 8 Aug. 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 5 Sep. 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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