insulant

in·su·lant  (ns-lnt, nsy-)

n.

A material used for insulation; an insulator.

Thesaurus

Noun

1.

insulant - a material that reduces or prevents the transmission of heat or sound or electricity insulating material, insulation building material - material used for constructing buildings lagging - used to wrap around pipes or boilers or laid in attics to prevent loss of heat corkboard - a heat-insulating building material consisting of cork granules that are made into sheets by compressing and baking