seal·​ant | \ ˈsē-lənt How to pronounce sealant (audio) \

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 Let the grout harden according to the instructions and apply a sealant if needed. Kelly Allen, House Beautiful, 17 Aug. 2021 That could mean sealant wasn’t applied properly when the threshold was installed. Washington Post, 7 July 2021 To stop cold air from blowing into the basement or crawlspace, fill any gaps under the mudsill with expanding foam sealant. Joseph Truini, Popular Mechanics, 17 Feb. 2021 On board, Salas and I saw a skinny sixth-grade boy have his teeth cleaned and get a sealant applied to his molars. Atul Gawande, The New Yorker, 23 Aug. 2021 Pittard said a sealant will be applied to the paintings to protect them from the elements, and the committee also must look into treatments that would allow graffiti to be cleaned off without damaging the paintings. Joe Tash, San Diego Union-Tribune, 13 June 2021 Sidewall tears are often too big for sealant or tubeless plugs. Joe Lindsey, Outside Online, 1 June 2021 How to prevent bites: To avoid contamination of ants inside the house, seal cracks and crevices with appropriate sealant and store sweet and sticky foods inside the cabinets. Sudiksha Kochi, USA TODAY, 2 June 2021 After putting together a jigsaw puzzle, apply a coat or two of a sealant with either a matte or flat finish, and hang on the wall — a wonderful memory. Washington Post, 1 July 2021

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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Time Traveler for sealant

Time Traveler

The first known use of sealant was in 1944

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Dictionary Entries Near sealant

sea language


sea lark

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Statistics for sealant

Last Updated

19 Sep 2021

Cite this Entry

“Sealant.” Dictionary, Merriam-Webster, Accessed 20 Sep. 2021.

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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 How to pronounce sealant (audio) \

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


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