Meaning of “cavity wall” in the English Dictionary

british dictionary

"cavity wall" in British English

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cavity wallnoun [ C ]

uk /ˌkæv.ɪ.ti ˈwɔːl/ us /ˌkæv.ə.t̬i ˈwɑːl/

a wall of a building formed from two walls with a space, usually for air, between them. It is made in this way to keep out water and cold air.

(Definition of “cavity wall” from the Cambridge Advanced Learner’s Dictionary & Thesaurus © Cambridge University Press)