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

Dentists can also sometimes stop cavities with fluoride varnishes and prevent them with dental sealants, which were once recommended only for children, Fontana said. —The New York Times News Service Syndicate, San Diego Union-Tribune, 26 May 2026

Products containing bleach, ammonia, or disinfecting ingredients can easily destroy the sealant applied to the surface. —Daley Quinn, Southern Living, 18 May 2026

Apply a sealant to wooden furniture to prevent moisture from seeping into the wood and encouraging algae to grow. —Mary Marlowe Leverette, The Spruce, 16 May 2026

Harsh scrubbing can wear away the protective sealants that keep water and bacteria out, damaging grout lines and shortening their lifespan. —Lauren Jarvis-Gibson, Miami Herald, 12 May 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