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Wiktionary
insulant

n. Any material used to provide insulation

WordNet
insulant

n. a material that reduces or prevents the transmission of heat or sound or electricity [syn: insulating material, insulation]

Usage examples of "insulant".

After a few deaths, one of their bright boys figured out how to build a strong insulant house by using three-ply rubberoid, with the middle layer perforated thousands of times to create tiny air pockets.