Synclastic

A surface on which the Gaussian Curvature $K$ is everywhere Positive. When $K$ is everywhere Negative, a surface is called Anticlastic. A point at which the Gaussian Curvature is Positive is called an Elliptic Point.

See also Anticlastic, Elliptic Point, Gaussian Quadrature, Hyperbolic Point, Parabolic Point, Planar Point