The inside lining of a book's cover, especially one that is decorative or made of rich material.
From French 'doublure,' literally meaning 'lining' or 'doubling,' derived from 'doubler' (to double or line). The French word comes from Latin 'duplus.' This architectural and bookbinding term entered English in the 18th century through book collectors and craftsmen.
Book collectors consider the doublure a hidden canvas for artistry—it's literally the first thing you see when you open a precious book, yet most people never notice it. Some antique books have doublures that are worth more than the pages inside, decorated with gold leaf and hand-painted designs that tell stories of their wealthy original owners.
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