This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A plate protecting a fighting person's back.

n. A metal plate on the rear of a computer's casing, used to cover a port or slot.

n. Same as backpiece.

n. A plate of cast-iron bolted against the back or outer edge of molding-boxes, for the purpose of preventing the liquid metal from forcing the sand outward and escaping from the mold: also applied to the plate used on the back of the wind-box of the Bessemer converter.

n. plate armor protecting the back; worn as part of a cuirass

"This would be better with some sort of backplate or translucent filling for the laser to shine on or through."

armor plate    plate armor    armor plating    armour plate    plate armour   

thumbwheel    forn    quick-release    dead-bolt    pintle