middle vs midriff

middle

noun
  • The central part of a human body; the waist. 

  • A centre, midpoint. 

  • The part between the beginning and the end. 

  • The middle stump. 

  • The middle voice. 

adj
  • Pertaining to the middle voice. 

  • Located in the middle; in between. 

  • Central. 

midriff

noun
  • The middle section of the human torso, from below the chest to above the waist 

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