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The property possessed by certain minerals of exhibiting three different colors when viewed from three different directions under white lights.
[From Greek trikhroos, three-colored : tri-, tri- + khrōs, color.]
American Heritage® Dictionary of the English Language, Fifth Edition. Copyright © 2016 by Houghton Mifflin Harcourt Publishing Company. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.