Codex

The codex (: codices ) was the historical ancestor format of the modern book. Technically the vast majority of modern books use the codex format of a stack of pages bound at one edge, along the side of the text. But the term "codex" is now reserved for older manuscript books, which mostly used sheets of vellum, parchment, or papyrus, rather than paper.
By convention, the term is also used for any Aztec codex, although the earlier examples do not... meer