Trichromatic refers to the capability of the eye to see colors in the spectrum of red, blue, and green. Antonyms for trichromatic are monochromatic, achromatic, and dichromatic. Monochromatic refers to a single color or hue. Achromatic, on the other hand, means without color, typically describing whites, grays, and blacks. Dichromatic is the ability to see color using two primary colors, as opposed to three.
For example, dogs are dichromatic since they can only see two primary colors: blue and yellow. Meanwhile, humans are trichromatic since we can see red, blue, and green colors. Therefore, if you describe something as trichromatic, you are indicating it contains all the primary colors.