dichromatic

adjective

1. Also dichroic. having or showing two colors; dichromic.
2. Zoology. exhibiting two color phases within a species not due to age or season.

adjective

1. Also: dichroic having or consisting of only two colours
2. (of animal species) having two different colour varieties that are independent of sex and age
3. able to perceive only two (instead of three) primary colours and the mixes of these colours

adj.

1. Having or exhibiting two colors.
2. Of, relating to, or characterized by dichromatism.