mediopassive vs omphalos

mediopassive

noun
  • A mediopassive construction; a phrase that uses the mediopassive voice. 

adj
  • Pertaining to a voice of a transitive verb that is both middle voice and passive voice or reflexive and passive voice. 

omphalos

noun
  • A raised central point; a boss. 

  • An ancient religious stone artifact, or baetylus, used to denote the direction of the "center" of the world. 

  • The theological proposition that the world was created with certain indicia of a history which had not actually occurred (such as the humans who had never been connected to umbilical cords being created with navels). 

  • The navel. 

  • The center or hub. 

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