A sharp ridge or edge where two surfaces meet, especially in architecture or masonry.
From Old French 'areste,' from Latin 'arista' meaning awl or sharp point. In architecture, it describes the thin line created where roof tiles, walls, or stones meet.
Architects still use 'arris' today when designing buildings—it's that precise sharp edge you see where roof edges meet, and weathered arris edges can tell you how old a building is because wind and rain round them off over centuries.
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