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 caulk for small openings and the right sealant for bigger gaps. — Jessica Safavimehr, Southern Living, 14 Aug. 2026

Trump blamed the sealant issues on vandalism without providing evidence, and felony charges were brought against a former Olympic canoeist, David Hearn, after he was accused of vandalizing the pool. — Matthew Daly, Chicago Tribune, 13 Aug. 2026

Fed chairman’s words suggest a rate hike Pirro’s case against Hearn, filed in early July, accused the 67-year-old of damaging the pool in front of the Lincoln Memorial by ripping up part of its sealant with his hands. — Kevin Breuninger, CNBC, 3 Aug. 2026

Loose parts of the sealant could be seen floating in the murky water. — Antonio Pequeño Iv, Forbes.com, 1 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