Building Trades. a wood or metal plate serving as a backing for a structural member.
Armor. a piece of plate armor for protecting the back: worn as part of a cuirass.

1650–60; back1 + plate1 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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Example sentences
Use of an oval backplate for a doghouse signal face probably wouldn't reduce wind loading, relative to a rectangular profile.
Blades shall be continuously welded to the backplate and inlet shroud.
All joints in the casing and backplate shall be machined.
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