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1. A piece of square-sawn timber 1? in. (47.6 mm) to under 4 in. (101.6 mm) thick, and 2 in. (50.8 mm) to under 4½ in. (114.3 mm) wide.
2. Hardwood timber cut to specified dimensions.
3. Any square-edged piece of hard-wood of nonstandard dimensions.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.