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codex

n. ~ A document, especially an old manuscript, made from two or more flat pieces that have been hinged to open like the leaves of a modern book.

Notes: 

The hinged binding of a codex distinguishes it from a scroll. The leaves of a codex may be made of any material, including metal, wood, ivory, or more commonly paper, papyrus, or vellum. The term is derived from early versions of the Christian Bible.