endpaper

The English word “endpaper” has 1 meaning listed here.

noun

Either of two folded sheets of paper used to connect the front and back covers of a book to the first and last pages; one side of each endpaper is glued to the cover board, and the other side forms a flyleaf.

From end + paper.

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Definitions are from Wiktionary, extracted by Kaikki.org, and are available under the CC BY-SA 4.0 licence.