/duy kroh"meuh tiz'euhm/ , n.
1. the quality or state of being dichromatic.
2. Also called dichromatopsia /duy kroh'meuh top"see euh/ . Ophthalm. a defect of vision in which the retina responds to only two of the three primary colors. Cf. monochromatism (def. 2), trichromatism (def. 3).
[ 1880-85; DICHROMAT(IC) + -ISM ]