featheredge brick

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arch brick, compass brick, featheredge brick, radial brick, radiating brick, radius brick, voussoir brick

1. A wedge-shaped brick used in arch or circular construction; its two larger faces are inclined toward each other.
2. Extremely hard-burnt brick from an arch.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.