chromatism vs polychromasia

chromatism

noun
  • chromesthesia 

  • The state of being coloured 

  • chromatic aberration 

polychromasia

noun
  • A disorder in which there is an abnormally high number of red blood cells in the bloodstream as a result of their having been prematurely released from the bone marrow during blood formation. 

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