wheel window

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wheel window:

see rose windowrose window,
large, stone-traceried, circular window of medieval churches. Romanesque churches of both England and the Continent had made use of the wheel window—a circular window ornamented by shafts radiating from a small center circle; and from this prototype developed
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wheel window

A large circular window in which the tracery radiates from the center; a variety of the rose window.
See also: Venetian window
Illustrated Dictionary of Architecture Copyright © 2012, 2002, 1998 by The McGraw-Hill Companies, Inc. All rights reserved

rose window, Catherine-wheel window, marigold window, wheel window

rose window
A large, circular medieval window, containing tracery disposed in a radial manner.

wheel window

A large circular window on which the radiation of tracery from the center is suggested; a variety of rose window; a Catherine wheel window.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.