A person who makes, maintains, or designs coffers, especially decorative architectural coffers.
From 'coffer' (Old French cofre) plus the agentive suffix '-er' (from Old English -ere). An occupational term for skilled craftspeople involved in coffer construction.
Medieval cofferers were specialized artists who had to understand geometry, carpentry, and aesthetics all at once—they were basically the architects' secret weapon for making buildings look rich and complex!
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