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
Painter’s tape lined the window frames, a makeshift sealant.
—
Anna Wiener, The New Yorker, 24 Mar. 2025
Zoom in: House Bill 369, the Parking Lot Reform and Modernization Act, would also ban coal tar sealants and other toxic pavement products that are harmful to humans and the environment.
—Alexandria Sands, Axios, 21 Mar. 2025
If pruning is unavoidable at that time, apply a commercial pruning sealant or latex paint to wounds so beetles that spread oak wilt disease are not drawn to the fresh cuts.
—Luke Miller, Better Homes & Gardens, 11 Mar. 2025
And even roofs that are still relatively young may begin to show signs of weakness — the sealant that holds asphalt shingles in place often begins to degrade after a decade and can fail when pummeled with high winds.
—Ron Lieber, New York Times, 19 Mar. 2025
See All Example Sentences for sealant
Examples are automatically compiled from online sources to
show current usage.
Read More
Opinions expressed in the examples do not represent those of Merriam-Webster or its editors.
Send us feedback.
Anna Wiener, The New Yorker, 24 Mar. 2025
Zoom in: House Bill 369, the Parking Lot Reform and Modernization Act, would also ban coal tar sealants and other toxic pavement products that are harmful to humans and the environment.
—Alexandria Sands, Axios, 21 Mar. 2025
If pruning is unavoidable at that time, apply a commercial pruning sealant or latex paint to wounds so beetles that spread oak wilt disease are not drawn to the fresh cuts.
—Luke Miller, Better Homes & Gardens, 11 Mar. 2025
And even roofs that are still relatively young may begin to show signs of weakness — the sealant that holds asphalt shingles in place often begins to degrade after a decade and can fail when pummeled with high winds.
—Ron Lieber, New York Times, 19 Mar. 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 29 Apr. 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
Love words? Need even more definitions?
Merriam-Webster unabridged
Share