back-plate

backplate

[bak-pleyt]
noun
1.
Building Trades. a wood or metal plate serving as a backing for a structural member.
2.
Armor. a piece of plate armor for protecting the back: worn as part of a cuirass.

Origin:
1650–60; back1 + plate1

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Based on the Random House Dictionary, © Random House, Inc. 2014.
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