from The American Heritage® Dictionary of the English Language, 5th Edition.
- noun The property possessed by certain minerals of exhibiting three different colors when viewed from three different directions under white lights.
from The Century Dictionary.
- noun In biology, trimorphism in the coloring of a species.
- noun The property possessed by some crystals of exhibiting different colors in three different directions when viewed by transmitted light.
from the GNU version of the Collaborative International Dictionary of English.
- noun (Min.) The quality possessed by some crystals of presenting different colors in three different directions.
from Wiktionary, Creative Commons Attribution/Share-Alike License.
- noun The property of some optically
anisotropic crystalsof transmittingdifferent coloursof lightin three different spatial directions.
from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
- noun pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions
from The American Heritage® Dictionary of the English Language, 4th Edition
[From Greek trikhroos, three-colored : tri-, tri- + khrōs, color.]
It displays a rare property called trichroism, displaying three colors sapphire blue, ruby red and amethyst purple, depending on which of its three axes you look at.