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

National Park Service officials say the Lincoln Memorial Reflecting Pool’s liner was sliced with a sharp blade, damaging sealant and prompting a Destruction of Government Property investigation and post–July Fourth repairs. — Matthew Daly, Los Angeles Times, 25 June 2026

Park Police said the incident happened on June 19—10 days after police received a report that the caulk over foam sealant at the pool was cut with a knife, according to a court filing from Wednesday. — Zachary Folk, Forbes.com, 25 June 2026

Apply a sealant to the sidewalk, if desired, to prevent future staining. — Karen Brewer Grossman, Southern Living, 25 June 2026

But recent photos of the pool show that the blue sealant has started to peel away, leaving chunks floating at the surface, while algae growth has turned the water green. — Lauren Zola, NBC news, 24 June 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