A thin strip which lines a window casing, next to the wall and opposite the pulley stile, and provides a smooth surface for the working of the weighted sash. Also known as back boxing; back jamb.
That piece of framing forming the back recess for boxing shutters.
Paper strip that is cemented to a book's backbone to bind the signatures and permit space between the backbone and the cover.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.