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Related to pleochroism: birefringence


The property possessed by some crystals of exhibiting different colors, especially three different colors, when viewed along different axes.

[pleo- + Greek khrōs, color + -ism.]

ple′o·chro′ic (plē′ə-krō′ĭk) adj.


(General Physics) 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)
[C19: pleo- + -chroism, from Greek khrōs skin colour]
pleochroic adj


(pliˈɒk roʊˌɪz əm)

the property of certain crystals of exhibiting different colors when viewed from different directions under transmitted light.
ple`o•chro′ic (-əˈkroʊ ɪk) adj.


a property of some crystals of showing variation in color when viewed in transmitted light or from different directions. Also called pleochromatism, polychroism, polychromatism. — pleochroic, pleochromatic, adj.
See also: Physics
ThesaurusAntonymsRelated WordsSynonymsLegend:
Noun1.pleochroism - the phenomenon of different colors appearing when certain crystals are viewed from different directions
dichroism - pleochroism of a crystal so that it exhibits two different colors when viewed from two different directions
optical phenomenon - a physical phenomenon related to or involving light
trichroism - pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions
References in periodicals archive ?
It is most important to cut this gem correctly, due to its pleochroism, to take full advantage of the full violet colour
Two types of amphibole are present, an earlier generation of magnesio-hornblende with greenish brown-brown-tan pleochroism and later pale green-green actinolitic hornblende.
Iolite has a remarkable feature known as pleochroism, meaning the colour changes when viewed from different directions, usually dark blue-violet, pale-blue, grey or yellow.