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apron piece[′ā·prən ‚pēs]
A beam that supports a landing or a series of winders in a staircase.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.
apron piece, pitching piece
A horizontal wood beam, fixed into a wall and projecting horizontally, which supports the ends of carriage pieces, roughstrings, and joists at the landings of a wooden staircase.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.