Dichromatic refers to a color scheme that uses only two colors. The antonyms for dichromatic would, therefore, be words that describe colors using multiple hues or colors. Words like polychromatic, multicolored, and kaleidoscopic would be antonyms for dichromatic. Additionally, words like varied, diverse, and eclectic would be suitable antonyms since they indicate a wide range of colors and hues. Dichromatic is a term used to describe something that is made up of only two parts or aspects. Therefore, words such as diverse, contrasting, and multifaceted could also be considered antonyms. Essentially any word that refers to a variety of colors or aspects would be a suitable antonym for dichromatic.