curtain wall

noun
(in a framed building) an exterior wall having no structural function.

Origin:
1850–55

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
curtain wall
 
n
1.  a non-load-bearing external wall attached to a framed structure, often one that is prefabricated
2.  a low wall outside the outer wall of a castle, serving as a first line of defence

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The outer wall, or curtain wall, was the castle's first line of defense.
No sleek curtain wall smooths over their jutting bones.
Brick work on the new wing is nearly complete, the next step is the curtain wall system installation and windows.
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