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Related to brace piece: brace up
1. The fittings and decorative elements of a mantel above a fireplace.
2. A shelf above a mantel; often called a mantelshelf.
3. The construction that serves as a support for the masonry above a fireplace.
4. A mantelshelf.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.