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Related to pleochroism: birefringence
Property of showing changes of color when illuminated along different axes, as in certain crystals or liquids.
[pleo- + G. chrōma, color]
pleochroism(plē-ŏk′rō-ĭzm) [″ + ″ + -ismos, condition]
The property of a crystal that produces different colors when light passes through it at different angles.