Trichromacy is a term used to describe having three types of cones in the eyes that allow for color vision. However, there are several synonyms for this biological phenomenon, including trichromatic vision, trichromatism, and triadism. These words all indicate the same idea, but are used in different contexts. Trichromatic vision is commonly used in scientific literature to describe the visual system of many animals, including humans. Trichromatism is another term that refers to the same condition, but is more commonly used to describe color blindness. Triadism is a less commonly used synonym, but still accurately describes the three types of cones involved in trichromacy.