dichromatic vs duocolor

dichromatic

adj
  • having two colors. 

  • having two independent channels for conveying color information in the eye. 

  • having two hues, either of which may be visible depending on both the concentration of the absorbing substance and the depth or thickness of the medium traversed, such as in pumpkin seed oil. A form of polychromatism. 

  • exhibiting dichroism; dichroic. 

  • occurring or existing in two different ornamentations or colors, typically as a form of sexual dimorphism. 

  • having a form of colorblindness in which only two of the three primary colors can be distinguished 

duocolor

adj
  • Having two colors. 

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