The material, process, or product of making or working with cardboard and cardboard boxes; also, decorative cardboard used in binding books.
From French cartonnage (from carton, derived from Italian cartone, from Latin charta meaning 'paper') plus the suffix '-age' (indicating a process or material).
Cartonnage in bookbinding refers to the decorative cardboard used on book covers instead of leather—it's a French word that English borrowed to describe an entire craft tradition of turning cheap cardboard into beautiful book covers.
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