dichromasyOphthalm.|daɪˈkrəʊməsɪ| [ad.mod.L. dichromasia, f. di-2 + Gr. χρῶµα colour.] = dichromatism 2. 1909in Webster.1937Brit.Jrnl.Psychol. Oct. 218 The tables of dichromasy in general, and of protanopia, deuteranopia and tritanopia in particular.1969[see next].