/ Dictionary / Index T trichroism: Meaning and Definition of Find definitions for: tri•chro•ism Pronunciation: (trī'krō-iz"um), [key] — n. Crystall. pleochroism of a biaxial crystal such that it exhibits three different colors when viewed from three different directions under transmitted light. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: trichroism (Thesaurus) trichroic trichromatic Related Content Daily Word Quiz: arid Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language