/ Dictionary / Index P pleochroism: Meaning and Definition of Find definitions for: ple•och•ro•ism Pronunciation: (plē-ok'rō-iz"um), [key] — n. the property of certain crystals of exhibiting different colors when viewed from different directions under transmitted light. Cf.(def. 1), Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: pleochroism (Thesaurus) pleochroic pleomorphic Related Content Daily Word Quiz: careening Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language