rete vs stroma

rete

noun
  • An anatomical part resembling or including a network. 

  • A rotating cutaway plate or overlay on an astrolabe or starmap which represents the horizon; used to locate stars and other astronomical features. 

  • A network of blood vessels or nerves. 

stroma

noun
  • The tissue structure of an organ, etc., that serves to support it. 

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