n. The property of some optically anisotropic crystals of transmitting different colours of light in three different spatial directions.
the GNU version of the Collaborative International Dictionary of English
n. The quality possessed by some crystals of presenting different colors in three different directions.
The Century Dictionary and Cyclopedia
n. In biology, trimorphism in the coloring of a species.
n. The property possessed by some crystals of exhibiting different colors in three different directions when viewed by transmitted light.
WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.
n. pleochroism of a crystal so that it exhibits three different colors when viewed from three different directions
Word Usage
"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."