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squinch arch[′skwinch ‚ärch]
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
1. Corbeling, often arcuate, built at the upper corners of a structural bay to support its tangent, smaller dome or drum.
2. A small arch across the corner of a square room which supports a superimposed mass; also called a sconce.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.