1. Part of a straight wall constructed between two advancing structures, such as bastions, buttresses, or piers. In a fortification it is the weakest element, and in a church it is pierced with large windows, as in a Perpendicular Gothic aisle.
2. Any plain enclosing screen-wall not supporting a roof.
3. Partition between two rooms, or subdividing a space.
4. In modern construction, a thin subordinate wall between piers or other structural members, the curtain being a filling, having no share in the support of other parts of the building. This principle was extended to the provision of entire external non-loadbearing skins, supported by the structure, and usually made of metal, glass, or some other type of cladding.
Hart,, Henn,, & and Sontag (1985)
"curtain-wall." A Dictionary of Architecture and Landscape Architecture. . Encyclopedia.com. (August 22, 2018). http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/curtain-wall
"curtain-wall." A Dictionary of Architecture and Landscape Architecture. . Retrieved August 22, 2018 from Encyclopedia.com: http://www.encyclopedia.com/education/dictionaries-thesauruses-pictures-and-press-releases/curtain-wall