curvature vs half-moon

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. 

half-moon

noun
  • Anything shaped like a crescent, especially the base of a fingernail. 

  • A semicircular or crescent-shaped Filipino butter cookie. 

  • The moon in its first or last quarter when only half the visible face is illuminated; a quarter moon. 

  • Synonym of black and white (“type of cookie”) 

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