embolus vs thickness

embolus

noun
  • An obstruction causing an embolism: a blood clot, air bubble or other matter carried by the bloodstream and causing a blockage or occlusion of a blood vessel. 

  • The structure on the end of the palp of male arachnids which contains the opening to the ejaculatory duct. 

thickness

noun
  • The property of being thick (slow to understand). 

  • A measure of how thick (in dimension) something is. 

  • A layer. 

  • The quality of being thick (in consistency). 

  • The property of being thick (in dimension). 

verb
  • To trim (wood) to a consistent thickness using a thickness planer. 

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