precuneiform vs sphenoid

precuneiform

adj
  • anterior to the cuneiform bone 

  • Prior to the introduction of cuneiform writing 

sphenoid

adj
  • Of or relating to the sphenoid bone which forms the base of the cranium, behind the eye and below the front part of the brain. It has two pairs of broad lateral ‘wings’ and a number of other projections, and contains two air-filled sinuses. 

  • Having a wedged shape. 

noun
  • A wedge-shaped crystal bounded by four equal isosceles triangles; the hemihedral form of a square pyramid. 

  • The sphenoid bone. 

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