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A bondstone that extends completely through a masonry wall and is exposed on each side of the wall.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
perpend, perpend stone
A rectangular stone set with its longest dimensions perpendicular to the face of a masonry wall; extends through the entire thickness of the wall so that it is exposed on both faces of the wall.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.