An Etymological Dictionary of Astronomy and Astrophysics
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Property of some crystals in which radiation polarized in one plane relative to the crystalline axes is freely transmitted, but radiation polarized perpendicular to this is absorbed. Tourmaline is a natural mineral with this property; Polaroid is a synthetic dichroic substance.

From Gk. dichro(os), from di- "two," → di-, + chroma "color" + -ism.

Dofâmi, from do "two," → bi- + fâm "color," + -i noun suffix.