Crystallography. pleochroism of a uniaxial crystal such that it exhibits two different colors when viewed from two different directions under transmitted light.
Chemistry. the exhibition of essentially different colors by certain solutions in different degrees of dilution or concentration.

1810–20; < Greek díchro(os) (see dichroic) + -ism

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World English Dictionary
dichroism (ˈdaɪkrəʊˌɪzəm)
1.  See also pleochroism Also called: dichromaticism a property of a uniaxial crystal, such as tourmaline, of showing a perceptible difference in colour when viewed along two different axes in transmitted white light
2.  a property of certain solutions as a result of which the wavelength (colour) of the light transmitted depends on the concentration of the solution and the length of the path of the light within the solution

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Medical Dictionary

dichroism di·chro·ism (dī'krō-ĭz'əm)

  1. The property of some solutions of showing different colors at different concentrations.

  2. The property of some crystals of exhibiting two different colors when viewed along different axes.

di·chro'ic adj.
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