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Definition of cavity wall noun from the Oxford Advanced Learner's Dictionary

cavity wall

noun

/ˌkævəti ˈwɔːl/

/ˌkævəti ˈwɔːl/

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a wall consisting of two walls with a space between them, designed to prevent heat from escaping
- cavity wall insulation
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See cavity wall in the Oxford Advanced American Dictionary

Check pronunciation: cavity wall

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noun

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B2

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