dichromatism Syllabification: (di·chro·ma·tism)Pronunciation: /dīˈkrōməˌtizəm/Definition of dichromatism noun 1(typically in an animal species) the occurrence of two different kinds of coloring. 2color-blindness in which only two of the three primary colors can be discerned. Derivatives dichromaticPronunciation: /ˌdīkrōˈmatik/ adjective dichromatism in other Oxford dictionaries Definition of dichromatism in the British & World English dictionary