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
Word History
Etymology
French, from Middle French, lining of a garment, from doubler to line, double + -ure