A piece, or plate which forms the back of anything, or which covers the back.

A piece of plate armor protecting the back; -- it is worn as part of a cuirass.

An armor plate for protection of the back; corresponds to the breastplate, to which it is attached by straps or hinges. Normally forged in one piece to fit the body, with additional plates ( lames) attached to protect the lower back region.

a component of a buoyancy compensator used in scuba diving to support diving cylinders on the diver's back

Cover over the rear of the crankcase of an engine.

The solid conductive disk that forms the fixed half of a condenser element.