English

Noun

dichromatism ‎(countable and uncountable, plural dichromatisms)

1. The condition of being dichromatic
2. (pathology) A form of colourblindness in which only two of the three primary colours can be distinguished
3. (biology) The condition when male and female birds have different plumage colors.
   • 2010, Geoffrey E. Hill, ‎Geoffrey Edward Hill, National Geographic Bird Coloration

     There long had been a bias among researchers to think of the evolution of sexual dichromatism as driven by changes in male coloration.

Related terms

• monochromatism
• dichromatism
• trichromatism