chromatopsiaPronunciation: /ˌkrəʊməˈtɒpsɪə/Definition of chromatopsia noun [mass noun] Medicine abnormally coloured vision, a rare symptom with various causes. Origin: mid 19th century: from chromato- 'colour' + Greek -opsia 'seeing'chromatopsia in other Oxford dictionaries Definition of chromatopsia in the US English dictionary