Syn*clas"tic (?), a. [Pref. syn- + Gr. kla^n to break.] (Math. Physics) Curved toward the same side in all directions; -- said of surfaces which in all directions around any point bend away from a tangent plane toward the same side, as the surface of a sphere; -- opposed to anticlastic. Sir W. Thomson.

Syn*clas"tic (?), a. [Pref. syn- + Gr. kla^n to break.] (Math. Physics) Curved toward the same side in all directions; -- said of surfaces which in all directions around any point bend away from a tangent plane toward the same side, as the surface of a sphere; -- opposed to anticlastic. Sir W. Thomson.

• (of a surface) curved toward the same side in all directions
  
• (mathematics) of a surface whose Gaussian curvature is positive at all points