
1) Architectural element 2) Clearstory 3) Window
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https://www.crosswordclues.com/clue/clerestory

1) Clearstory
Found on
https://www.crosswordclues.com/clue/clerestory

In architecture, clerestory (i; lit. clear storey, also clearstory, clearstorey, or overstorey) are any high windows above eye level. The purpose is to bring outside light, fresh air, or both into the inner space. Historically, clerestory denoted an upper level of a Roman basilica or of the nave of a Romanesque or Gothic church, the walls of which...
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http://en.wikipedia.org/wiki/Clerestory

upper storey of a church; windows near the roof of a building
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http://phrontistery.info/c.html

• (n.) The upper story of the nave of a church, containing windows, and rising above the aisle roofs. • (n.) Same as Clearstory.
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http://thinkexist.com/dictionary/meaning/clerestory/

the upper story of a church where it rises above the aisle roof. Window openings allow extra light into the interior of the church.
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http://www.britainexpress.com/History/medieval/church-glossary.htm

in architecture, any fenestrated (windowed) wall of a room that is carried higher than the surrounding roofs to light the interior space. In a large ... [3 related articles]
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http://www.britannica.com/eb/a-z/c/96

A window located high in a wall near the eaves that allows daylight into a building interior, and may be used for ventilation and solar heat gain. Related category • WINDOWS TOPICS
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http://www.daviddarling.info/encyclopedia/C/AE_clerestory.html

also clearstory: the upper part of the nave wall of a church pierced by windows
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http://www.encyclo.co.uk/local/20559

In architecture, the windows in the upper part of the central nave of a basilican church or hall. Its purpose is to admit clear light, this method of lighting being constantly used by the Romans in...
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http://www.encyclo.co.uk/local/20688

A window, or row of windows, in the upper part of a room where it can admit light from above an adjacent roof
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http://www.encyclo.co.uk/local/21113
Clere'sto`ry (klēr'stō`rȳ)
noun Same as
Clearstory .
Found on
http://www.encyclo.co.uk/webster/C/90

An upper story of a building with windows above adjacent roofs.
Found on
http://www.pitt.edu/~medart/menuglossary/INDEX.HTM

The clerestory is that part of the walls of a Gothic church which rise above the aisle and contains a row of windows. Its purpose being to admit as much light as possible to the nave.
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http://www.probertencyclopaedia.com/browse/TC.HTM

[
n] - part of an interior wall rising above the adjacent roof with windows admitting light
Found on
http://www.webdictionary.co.uk/definition.php?query=clerestory

Part of the church wall above the triforium or arcade usually containing windows.
Found on
https://www.encyclo.co.uk/local/20434

Upper storey of the nave walls of the church, lit by windows.
Found on
https://www.encyclo.co.uk/local/20434
clearstory noun part of an interior wall rising above the adjacent roof with windows admitting light
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https://www.encyclo.co.uk/local/20974

Windowed area of the church above the side aisles and above the wall of the central part of the nave (fig.6).
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https://www.encyclo.co.uk/local/22199

A window located high in a wall near the eaves that allows daylight into a building interior, and may be used for ventilation and solar heat gain.
Found on
https://www.encyclo.co.uk/local/22819

a portion of an interior rising above adjacent rooftops and having windows admitting daylight to the interior. · a raised construction, as on the roof of a railroad car, having windows or slits for admitting light or air.
Found on
https://www.infoplease.com/dictionary/clerestory
No exact match found.