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exedra, exhedra

exedra, 1
1.A large niche or recess, usually with a bench or seats, semicircular or rectangular in plan and either roofed or unroofed.
2. In a church, a large apsidal extension of an interior volume, normally on a main axis.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.
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