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Answer for the clue "Pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions ", 10 letters:
trichroism

Word definitions for trichroism in dictionaries

WordNet Word definitions in WordNet
n. pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions

Wiktionary Word definitions in Wiktionary
n. The property of some optically anisotropic crystals of transmitting different colours of light in three different spatial directions.

The Collaborative International Dictionary Word definitions in The Collaborative International Dictionary
Trichroism \Tri"chro*ism\, n. [Pref. tri- + Gr. ? color: cf. F. trichro["i]sme.] (Min.) The quality possessed by some crystals of presenting different colors in three different directions.