curvature vs oxbow

curvature

noun
  • The shape of something curved. 

  • The extent to which a Riemannian manifold is intrinsically curved. 

  • The extent to which a subspace is curved within a metric space. 

oxbow

noun
  • A meander in a river; the land enclosed by such a loop 

  • A U-shaped piece of wood used as a collar for an ox, the upper parts fastened to its yoke 

How often have the words curvature and oxbow occurred in a corpus of books? (source: Google Ngram Viewer )