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
Additionally, their cores can (usually) be removed, allowing sealant to be injected through them into tubeless tires.
—
New Atlas, 11 Jan. 2026
Its main purpose is to act as a sealant to keep water from getting behind the tiles to cause mold or mildew to develop in the wall.
—Ashlyn Needham, Southern Living, 10 Jan. 2026
Use a polyurethane sealant on wood for long-term protection.
—Mary Marlowe Leverette, The Spruce, 10 Jan. 2026
There are various ways to transform a puzzle into a placemat, but the simplest option is to glue the pieces together, add a backing for support, and seal the finished placemat with a food-safe sealant.
—Cori Sears, Better Homes & Gardens, 27 Dec. 2025
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New Atlas, 11 Jan. 2026
Its main purpose is to act as a sealant to keep water from getting behind the tiles to cause mold or mildew to develop in the wall.
—Ashlyn Needham, Southern Living, 10 Jan. 2026
Use a polyurethane sealant on wood for long-term protection.
—Mary Marlowe Leverette, The Spruce, 10 Jan. 2026
There are various ways to transform a puzzle into a placemat, but the simplest option is to glue the pieces together, add a backing for support, and seal the finished placemat with a food-safe sealant.
—Cori Sears, Better Homes & Gardens, 27 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 20 Jan. 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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