dichroicPronunciation: /dʌɪˈkrəʊɪk/Definition of dichroic adjective (of a crystal) showing different colours when viewed from different directions, or (more generally) having different absorption coefficients for light polarized in different directions. Derivatives dichroism noun Origin: mid 19th century: from Greek dikhroos (from di- 'twice' + khrōs 'colour') + -icdichroic in other Oxford dictionaries Definition of dichroic in the US English dictionary