pleochroism of a biaxial crystal such that it exhibits three different colors when viewed from three different directions under transmitted light.
Origin of trichroism
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019
Word Origin for trichroism
C19: from Greek trikhroos three-coloured, from tri- + khrōma 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