cavity wall

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

1905–10 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
cavity wall
a wall that consists of two separate walls, joined by wall-ties, with an airspace between them

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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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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