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

Use The Right Cleaner Protect the sealant on your floors by sticking with a hardwood floor cleaner. — Brandee Gruener, Southern Living, 13 Sep. 2026

But shortly after the pool reopened, in June, algae returned in force and the sealant peeled, leading crews to repeatedly drain and scrub the basin over the summer. — Janay Kingsberry, The Atlantic, 5 Sep. 2026

Above-mount sinks can trap dirt and water; waterproof sealants and splash guards can help reduce maintenance. — Andrea Beck, Better Homes & Gardens, 3 Sep. 2026

One local product, the HM1176 polythioether sealant, has been used on the C919 and China’s CJ-1000 engine series since 2025. — Atharva Gosavi, Interesting Engineering, 22 Aug. 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