1. Also called raising plate. Building Trades.a horizontal member built into or laid along the top of a wall to support and distribute the pressure from joists, rafters, etc.
2. Mach.a vertical metal plate secured against a wall, as to attach a bracket.
3. Mining.one of the longer members of a set. Cf. end plate.
4. See switch plate.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.