• synonyms


[plee-ok-roh-iz-uh m]
  1. the property of certain crystals of exhibiting different colors when viewed from different directions under transmitted light.Compare dichroism(def 1), trichroism.
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Origin of pleochroism

First recorded in 1855–60; pleochro(ic) + -ism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

Examples from the Web for pleochroism

Historical Examples

  • Both are light colored, and the pleochroism of the hypersthene is sometimes quite faint.

    Mount Rainier


  • The pleochroism is strong, the pleochroic colours being usually green, yellow and brown.

British Dictionary definitions for pleochroism


  1. 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)
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Derived Formspleochroic (ˌpliːəˈkrəʊɪk), adjective

Word Origin

C19: pleo- + -chroism, from Greek khrōs skin colour
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012