seal·​ant | \ˈsē-lənt \

Definition of sealant 

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

Under its plan, CRC will cover the costs of reapplying the sealant to the panels every 10-years. Washington Post, "Flawed Silver Line concrete to get additional inspections," 22 May 2018 For one thing, the substance applied in rejuvenating an asphalt roadway is not as thick as the sealant applied to driveways and parking lots. Dan Moran, Lake County News-Sun, "Moran: Lake County looks to rejuvenate pavement before wear-and-tear sets in," 6 July 2018 Keith Couch, CRC’s project director, told MWAA’s board of directors that the company would deal with the issue by treating the panels every 10 years with a sealant to ensure materials meet the 100-year life span required in their contract. Washington Post, "Metro says it will do independent inspections of Silver Line concrete," 17 May 2018 Back in 2013, a certain hydrophobic sealant called Ultra-Ever Dry swept through a niche portion of the Internet thanks to what seemed like a too-good-to-be-true demo video that went viral. Lee Hutchinson, Ars Technica, "The Internet-demanded, partially scientific testing of Ultra-Ever Dry (in HD!)," 4 July 2018 Tracking how and where sealant is used in the county is difficult, Weinstein said, because much of its use is on private property. Kate Magill, Columbia Flier, "Fifth-graders lead a call to ban some pavement sealants in Howard," 19 June 2018 This is especially true for applying sealants and adhesives. Andrew J. Hawkins, The Verge, "Tesla built a giant tent to expand production of the Model 3," 22 June 2018 The county’s Department of Public Works does not use coal-tar sealants, as sealing pavements isn’t part of its maintenance plans, said Director Jim Irvin. Kate Magill, Columbia Flier, "Fifth-graders lead a call to ban some pavement sealants in Howard," 19 June 2018 According to the archeological evidence—flasks and stoppers and sealants—the earliest wine production occurred in what is now Armenia, with the first vintage sometime around 4000 B.C. Adam Gopnik, The New Yorker, "A Vintner’s Quest to Create a Truly American Wine," 14 May 2018

These example sentences are selected automatically from various online news sources to reflect current usage of the word 'sealant.' Views expressed in the examples do not represent the opinion of Merriam-Webster or its editors. Send us feedback.

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First Known Use of sealant

1944, in the meaning defined at sense 1

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Last Updated

29 Sep 2018

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The first known use of sealant was in 1944

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More Definitions for sealant



English Language Learners Definition of sealant

: a substance that is put on a surface in order to protect it from air, water, etc.


seal·​ant | \ˈsē-lənt \

Medical Definition of sealant 

: 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

Comments on sealant

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to clear from alleged fault or guilt

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