insulant

[ in-suh-luhnt, ins-yuh- ]
/ ˈɪn sə lənt, ˈɪns yə- /

noun

an insulating material, as used in building trades.

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Origin of insulant

First recorded in 1930–35; insul(ate) + -ant
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020