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https://www.crosswordclues.com/clue/muqarnas

type of decorative corbel used in Islamic architecture that in some circumstances, resembles stalactites.
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http://en.wikipedia.org/wiki/Glossary_of_architecture

Muqarnas (Arabic: مقرنص Persian: مقرنس) is a type of corbel employed as a decorative device in traditional Islamic and Persian architecture. The related mocárabe refers only to projecting elements that resemble stalactites, alveole. An architectural ornamentation reminiscent of stalactites, muqarnas developed around the middle of the 10...
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http://en.wikipedia.org/wiki/Muqarnas

[3 related articles]
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http://www.britannica.com/eb/a-z/m/139

This is an Arabic word ('mukarnas' in modern Turkish) for a form of vaulting. It is the geometric subdivision of a squinch, or cupola, or corbel, into a large number of miniature squinches, producing a sort of cellular structure. Also known as a honeycomb vault. The Muqarnas vault is purely decorative and has no loadbearing function. The individual...
Found on
http://www.virtualani.org/glossary/index.htm
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