Meaning of anticlastic

an•ti•clas•tic

Pronunciation: (an"tē-klas'tik, an"tī-), [key]
— adj. Math.
  1. (of a surface) having principal curvatures of opposite sign at a given point. Cf. synclastic.
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.