sealant

noun

material to fill in gaps in a surface

L42066 on Wikidata ↗

Wiktionary

Pronunciation: /ˈsiːlənt/

noun

Etymology: Etymology tree Proto-Indo-European *sek- Proto-Indo-European *-nóm Proto-Italic *seknom Latin signum Proto-Indo-European *-lós Proto-Indo-European *-elós Proto-Italic *-elos Latin -lum Latin sigillum Anglo-Norman seelbor. Middle English sel English seal Proto-Indo-European *-onts Latin -ns Latin -āns Old French -antbor. Proto-Indo-European *-onts Proto-Germanic *-ndz Proto-West Germanic *-andī Old English -ende Middle English -ant English -ant English sealant From seal + -ant.

Any material used to seal a surface so as to prevent passage of a fluid.
A mixture of polymers, fillers, and pigments used to fill and seal joints where moderate movement is expected.