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

Henkel is broadly known as a global industrial products and consumer goods company with offerings such as laundry detergent, industrial products, adhesives, sealants, and haircare. — Sawdah Bhaimiya, CNBC, 8 Oct. 2026

Doing so would entail repairing cracks that admit water, maintaining the foundations of each section, applying a sealant to slow the weathering process, and keeping the encroachment of vegetation in check. — Jeffrey Weiss, Artforum, 1 Oct. 2026

For example, standard plastics, composites, sealants, and lubricants manufactured on Earth will release trapped gases and volatile compounds, and rapidly degrade in Mars' near-vacuum. — New Atlas, 26 Sep. 2026

Cut it to length with scissors to close any gaps, then add caulk or other sealants to add insulation and extra protection from insects. — Caley Sturgill, Southern Living, 25 Sep. 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