cochlea vs curvature

cochlea

noun
  • A spiral-shaped shell, especially that of a snail. 

  • The complex, spirally coiled, tapered cavity of the inner ear of higher vertebrates, which contains the organ of Corti and in which sound vibrations are converted into nerve impulses. 

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. 

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