tongue-and-groove boards
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dressed
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

dressed and matched boards
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.