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Definition of sealant

sealant

/ˈsiːlənt/
seal · ant
Plural:sealants
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sealant Lexical Profile

sealant Game Scores & Validity

• noun

1

A substance, such as silicone, caulk, or resin, applied to a surface or joint to make it airtight or watertight, or to protect it from moisture, dust, and decay.

Example

"The contractor applied a waterproof silicone sealant around the edges of the new bathtub to prevent leaks."

2

In dentistry, a thin protective plastic coating painted onto the chewing surfaces of the back teeth to prevent cavities.

Example

"The dentist recommended applying a dental sealant to the child's newly erupted molars to protect them from decay."

Synonyms
View all synonyms for sealant

• Nearby Words

seahorse
seal
sealable
sealant
sealer
sealion
sealskin

Word Origin & Etymology

Coined in the early 20th century from the verb 'seal' (from Old French 'seel' and Latin 'sigillum', meaning a small mark or signet) combined with the agentive suffix '-ant'.

Cite this Entry

Wordmom. (2026). Definition of Sealant. In Wordmom Dictionary. Retrieved Nov 5, 2026, from https://wordmom.com/dictionary/sealant
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