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A material used for insulation; an insulator.
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.
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|Noun||1.||insulant - a material that reduces or prevents the transmission of heat or sound or electricity|
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
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