kerf vs tibia

kerf

noun
  • The flattened, cut-off end of a branch or tree; a stump or sawn-off cross-section. 

  • The portion or quantity (e.g. of wood, hay, turf, wool, etc.) removed or cut off in a given stroke. 

  • The distance between diverging saw teeth. 

  • The groove or slit created by cutting or sawing something; an incision. 

verb
  • To cut a piece of wood or other material with several kerfs to allow it to be bent. 

tibia

noun
  • The second segment from the end of an insect's leg, between the femur and tarsus. 

  • The inner and usually the larger of the two bones of the leg or hind limb below the knee, the shinbone 

  • The third segment from the end of an arachnid's leg, between the patella and metatarsus. 

  • A musical instrument of the flute kind, originally made of the leg bone of an animal. 

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