A fine-grained slate or bluish-gray stone used for roofing tiles and writing surfaces.
From French 'ardoise,' which comes from Old French and likely has origins in Vulgar Latin. The word traveled through European languages as the material itself was traded along medieval routes, eventually referring specifically to the quality slate from certain French quarries.
The word 'ardoise' spread across Europe because the slate itself was so valuable—it's one of the few materials that naturally splits into thin, waterproof sheets, making it revolutionary for roofing before modern materials existed.
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