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

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

After the paint is completely dry, coat the handles with a nontoxic sealant, such as shellac. — Jodi Levine, Parents, 21 Aug. 2026

Cleaning chemicals can also easily strip sealants from delicate surfaces like wood, marble, and granite. — Louise Parks, Martha Stewart, 20 Aug. 2026

Use caulk for small openings and the right sealant for bigger gaps. — Jessica Safavimehr, Southern Living, 14 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