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insulation
The definition of insulation is material used to trap air and sound.
(noun)Fiberglass put into the walls of a house and into the attic in order to keep warm air in and cold air out during the winter months is an example of insulation.
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See insulation in Webster's New World College Dictionary
noun
- an insulating or being insulated
- any material used to insulate
See insulation in American Heritage Dictionary 4
noun
- The act of insulating or the state of being insulated.
- A material or substance used in insulating: soundproof cork insulation; a layer of trapped air that serves as insulation.
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