endpaper

noun

1. 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.

   “Meronyms: flyleaf, pastedown”

   “Lay the folded endpaper flat, fold facing left, and apply spray adhesive to the paper on the exposed half. Lay the endpaper on the inside front cover, smoothing it to adhere the paper against the cover and the inner spine.”