subframe, rough buck, sub-buck
1. A secondary frame, usually formed of wood members or channel-shaped metal members, which supports the finish frame of a door or window; attached to the wall in which the finished frame, knocked-down frame, door casing, or door lining is set; a buck frame.
2. A frame which supports a panel used as a wall finish.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.