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Descriptive of brick, lumber, or stone which has been prepared, shaped, or finished by cutting, planing, rubbing, or sanding one or more of its faces.
dressed and matched boards, D and M boards, dressed and matched lumber, planed matchboards, tongue-and-groove boards
Boards or lumber that has been planed smooth; cut so that a tongue along one edge fits into a groove cut along the edge of the adjacent piece.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.