cavity wall

noun Masonry.
a wall built with an enclosed inner space to prevent penetration by water.

Origin:
1905–10

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World English Dictionary
cavity wall
 
n
a wall that consists of two separate walls, joined by wall-ties, with an airspace between them

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The earlier intense radiation had colored the salt of the cavity wall various shades of blue, green, and violet.
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