insulant

[ in-suh-luhnt, ins-yuh- ]

noun

1. an insulating material, as used in building trades.

Word History and Origins

Origin of insulant¹

First recorded in 1930–35; insul(ate) + -ant

Example Sentences

“We will try to persuade lawmakers that flammable material should no longer be allowed to be used as an insulant, only mineral material that can’t burn, ensuring that it’s no longer possible for a fire to spread via the cladding,” he told Der Spiegel.

From The Guardian