1. In a knocked-down or welded doorframe assembly, the reinforcement at the junction of the head and jamb.
2. A strip of expanded-metal lath bent to form a 90°angle; used in an inside corner of a plaster wall, ceiling, etc., to prevent cracks in plastering. Also called corner lath.
McGraw-Hill Dictionary of Architecture and Construction. Copyright © 2003 by McGraw-Hill Companies, Inc.