Longman Dictionary of Contemporary English homepage

insulation

 noun
     
Related topics: Household, Building
in‧su‧la‧tion [uncountable]
1TBDH when something is insulated or someone insulates something:
Good insulation can save you money on heating bills.
2TBDH material used to insulate something, especially a building:
glass-fibre insulation
Definition from the Longman Dictionary of Contemporary English
Advanced Learner's Dictionary.
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