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Definition of Anticlastic
1. a. Having to opposite curvatures, that is, curved longitudinally in one direction and transversely in the opposite direction, as the surface of a saddle.
Definition of Anticlastic
1. Adjective. (context: of a surface) curved in opposite ways in two directions; saddle-shaped ¹
2. Adjective. (mathematics) of a surface whose Gaussian curvature is negative at all points ¹
¹ Source: wiktionary.com