two-by-four(redirected from two-by-fours)
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A piece of timber, nominally 2 in.(5 cm) thick by 4 in. (10 cm) wide, but actually 1? in. by 3? in. (4.13 cm by 9.21 cm).
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.