An attic or loft space in a building, especially in French architecture; a storage room for grain.
From French 'grenier' (granary/loft), from Latin 'granarium' (grain storage), where grain was stored in upper floors to prevent moisture and pests.
French architecture evolved to put granaries upstairs for practical storage, and over time 'grenier' became the word for any attic—form following function, then the function forgotten but name remaining.
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