Sometimes called "endleaves," an endpaper is the double leaf at the very front and back of a book, half of which is pasted to the inside of the boards, the other half of which makes up the front and back free endpapers.
Also referred to as "ends" or "endleaves". A folded sheet of paper one half of which is pasted to the inside of either the front or back case of a book and the other half to the inside edge of the first (or last) page of the book. Endpapers are typically a different stock (paper) that the text. 80# offset is standard. And exception to this is a self ended book which means that the endleaves are part of the first and last signatures of the book and are therefore all the same stock. [Back
The folded sheet of paper pasted to the inside of the front or back cover and attached to the edge of the first or last page of a hardcover book during manufacturing. Endpapers are not normally numbered.
a double sheet of paper added at the front and back of a book. The outer portion of the sheet is pasted to the inner surface of the cover and the inner portion becomes the first or last page of the book. The outer portion is referred to as the “pastedown” and the inner portion is referred to as the “free endpaper.
There are two sorts of endpapers. The folded sheet of paper pasted to the inside of the front or back cover is known as a paste-down endpaper or, less formally, a paste-down. The first and last free pages of a book, usually blank, are known as free endpapers.