cavity wall

He scrambled outside to find a 25-foot-wide crater just beyond the mud wall surrounding his family compound.
The Dangerous Drug-Funded Secret War Between Iran and Pakistan|Umar Farooq|December 29, 2014|DAILY BEAST
A flash of surprise and pleasure lit the fine eyes of the haughty beauty perched up there on the palace wall.
The Red Year|Louis Tracy
Kind of a reception-room in there—guess I know a reception-room from a hole in the wall.
Boys and Girls Bookshelf; a Practical Plan of Character Building, Volume I (of 17)|Various
Distance, the uncertain light, and imagination, magnified it to a high wall; high as the wall of China.
The Giant of the North|R.M. Ballantyne
He leant against the wall of his refuge, notwithstanding this boast, and licked the ice to moisten his parched lips.
The Giant of the North|R.M. Ballantyne
A little boy aged two years and four months was deprived of a pencil from Thursday to Sunday for scribbling on the wall-paper.
Children's Ways|James Sully

British Dictionary definitions for cavity wall

cavity wall

noun

a wall that consists of two separate walls, joined by wall-ties, with an airspace between them

Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012