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WordReference Random House Unabridged Dictionary of American English © 2024ple•och•ro•ism (plē ok′rō iz′əm),USA pronunciation n. - Crystallography, Opticsthe property of certain crystals of exhibiting different colors when viewed from different directions under transmitted light. Cf. dichroism (def. 1), trichroism.
- pleochro(ic) + -ism 1855–60
Collins Concise English Dictionary © HarperCollins Publishers:: pleochroism /plɪˈɒkrəʊˌɪzəm/ n - a property of certain crystals of absorbing light to an extent that depends on the orientation of the electric vector of the light with respect to the optic axes of the crystal. The effect occurs in uniaxial crystals (dichroism) and esp in biaxial crystals (trichroism)
Etymology: 19th Century: pleo- + -chroism, from Greek khrōs skin colourpleochroic /ˌpliːəˈkrəʊɪk/ adj |