loin vs popliteus

loin

noun
  • The part of the body (of humans and quadrupeds) at each side of the backbone, between the ribs and hips 

  • Any of several cuts of meat taken from this part of an animal 

popliteus

noun
  • A small muscle at the back of the knee that aids in bending the knee and in the rotation of the lower leg. 

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