sealant

noun

seal·​ant ˈsē-lənt 

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

Smile Dental Services will provide dental exams, varnish treatments, sealants, oral health education and referrals for more services to county residents younger than 20. — Daniel Lempres, Sacbee.com, 10 July 2026

Prosecutors allege Hearn ripped up new sealant and caused more than $1,000 in damage, while defense lawyers call the evidence weak and the indictment a politicized attempt to shift blame. — Michael Kunzelman, Los Angeles Times, 9 July 2026

In another instance, a 26-year-old white man is alleged to have removed a piece of blue sealant and had it in his hand. — Gary Grumbach, NBC news, 9 July 2026

Mock says the ingredients in these (nearly) do-it-all formulas might prove too harsh, compromising the sealant and damaging or discoloring the stone beneath. — Patricia Shannon, Southern Living, 7 July 2026

Word History

First Known Use

1944, in the meaning defined at sense 1

Medical 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