curtain wall

After the curtain calls, Christopher comes back to explain a complicated math problem.
Hedwig, Hugh & Michael Cera: 12 Powerhouse Theater Performances of 2014|Janice Kaplan|December 31, 2014|DAILY BEAST
She walked away toward another door, which was masked with a curtain that she lifted.
Confidence|Henry James
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

British Dictionary definitions for curtain wall

curtain wall

noun

a non-load-bearing external wall attached to a framed structure, often one that is prefabricated

a low wall outside the outer wall of a castle, serving as a first line of defence

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