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A strengthening pier perpendicular and bonded to a retaining wall.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
In masonry structures, a buttress, spur wall, pier, or projecting portion, extending upward from the foundation or from the inner face of a basement, abutment, or retaining wall to provide additional resistance to thrust.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.