seal·​ant ˈsē-lənt How to pronounce sealant (audio)
: a sealing agent
a radiator sealant
: a plastic material applied to parts of teeth with imperfections (such as pits and fissures) to prevent dental decay

Example Sentences

Recent Examples on the Web Nitrogen purging tends to make binoculars cheaper, but argon purging tends to create a better moisture sealant. Alec Scherma, Good Housekeeping, 24 Oct. 2022 If a duct seam is leaking, apply duct sealant ($8.67 for 10.5 ounces from Master Flow at Home Depot), which will work better in attic conditions than foil tape made for sealing ducts. Jeanne Huber, Washington Post, 21 Oct. 2022 Quality silicone, silicone-latex caulk, foam sealant, or weather stripping can be used to close these entry points. oregonlive, 8 Oct. 2022 Insulating water tanks, pipes and radiators, and draft-proofing using sealant, are other easy and quick ways to save money on energy bills. Isabelle Jani-friend, CNN, 16 Mar. 2022 If your shelves will be used to store items that could leak, consider sealing the wood using a waterproof sealant. Kamron Sanders, Better Homes & Gardens, 29 Aug. 2022 Deanna Stockwell, a 24-year-old research chemist in PPG’s sealant department, donned gloves, sand socks, and a neon yellow shirt with a small blue PPG icon near the frocket before joining her tug of war team. WIRED, 22 Aug. 2022 About 84,000 square feet of concourses and large ADA ADA -3.3% ramps on the north side come with a true track surface—the same surface as the main track, just with a sealant so to withstand those pesky mustard stains from hot dog spills. Tim Newcomb, Forbes, 12 July 2022 There is a closure eastbound on Interstate 440 near Little Rock, in which the inside and middle lanes are closed for nearly 2 miles as crews place a protective sealant on the surface of the highway. Arkansas Online, 1 July 2022 See More

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.

Word History

First Known Use

1944, in the meaning defined at sense 1

Time Traveler
The first known use of sealant was in 1944

Dictionary Entries Near sealant

Cite this Entry

“Sealant.” Dictionary, Merriam-Webster, Accessed 26 Nov. 2022.

Medical Definition



seal·​ant ˈsē-lənt How to pronounce sealant (audio)
: 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
Last Updated: - Updated example sentences
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