Curving in opposite directions along perpendicular axes; describing a surface that curves convexly in one direction and concavely in another.
From anti- (opposite) + Greek klasis (breaking, bending). Technical term in geometry, architecture, and material science describing bidirectional curvature.
Anticlastic surfaces are what you see in saddles, some architectural domes, or when you twist a fabric—opposite curves in perpendicular directions create fascinating structural properties.
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