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Diocletian window

 
 

Semicircular window divided into three lights (compartments) by two vertical mullions, with the central light usually wider than the two side lights. Its name comes from its use in the Baths of Diocletian in Rome (AD 302). It was revived in the 16th century by Andrea Palladio and others in the form of a window having an arched central light flanked by narrower, square-headed apertures, known as a Palladian or Venetian window.

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Architecture and Landscaping: Diocletian window
 

Semicircular opening (usually a window) subdivided by two plain mullions into three compartments. Named after its use in the thermae (baths) of Diocletian, Rome (ad 306), its alternative name is a thermal window, commonly found in Palladian and Neo-Classical architecture.

Diocletian or thermal window
Diocletian or thermal window

 
 

 

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Britannica Concise Encyclopedia. Britannica Concise Encyclopedia. © 2006 Encyclopædia Britannica, Inc. All rights reserved.  Read more
Architecture and Landscaping. A Dictionary of Architecture and Landscape Architecture. Copyright © 1999, 2006 by Oxford University Press. All rights reserved.  Read more