horseshoe vs incurvature

horseshoe

noun
  • The U shape of a horseshoe. 

  • The U-shaped shoe of a horse, now typically made of metal; by extension, a representation of this used to play the game horseshoes, hung as a luck charm, etc. 

  • The symbol ⊃. 

  • An open-faced sandwich originating from Springfield, Illinois, consisting of thick-sliced toasted bread, often Texas toast, a hamburger patty, French fries, and a cheese sauce. 

  • A well-developed set of triceps brachii muscles. 

verb
  • To apply horseshoes to (a horse). 

incurvature

noun
  • curvature; curving 

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