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

Note that some sealants can last up to 20 years while others last 10 years only. — Helen Andriatsitohaina, The Spruce, 24 June 2026

Pirro alleged that Hearn damaged about 2 square feet of the sealant from the bottom of the pool. — Marco Gacina, NBC news, 2 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

Hearn previously told the Washington Post he was arrested after reaching into the pool and grabbing a piece of sealant already peeling, but did not remove anything. — Zachary Folk, Forbes.com, 2 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