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


cavity wall

BrE BrE//ˌkævəti ˈwɔːl//
; NAmE NAmE//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
See the Oxford Advanced American Dictionary entry: cavity wall