doublure
noun
dou·blure
ˌdəˈblu̇(ə)r,
düˈ-
plural -s
1
: the lining of a book cover
especially
: an ornamental lining (as of tooled leather, painted vellum, or rich brocade)
2
: the reflexed margin of a trilobite's carapace
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Merriam-Webster unabridged
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