Definition of "dichromic"

dichromic

adjective
not comparable
1. furnishing or giving two colours; said of defective vision, in which all the compound colours are resolvable into two elements instead of three
  Quotations
  Their vision is therefore, in fact, dichromic; all their compound colours are resolvable into two elements only instead of three.
  1866, Sir J. Herschel, Familiar Lectures on Scientific Subjects
2. containing two atoms of chromium