Hypertext Webster Gateway: "backplate"
From Webster's Revised Unabridged Dictionary (1913) (web1913)
Backpiece \Back"piece`\, Backplate \Back"plate`\, n. [Back,n.or
a. + piece, plate. ]
A piece, or plate which forms the back of anything, or which
covers the back; armor for the back.
From WordNet (r) 1.7 (wn)
backplate
n : plate armor protecting the back; worn as part of a cuirass
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