/ Dictionary / Index P Purkinjeshift: Meaning and Definition of Find definitions for: Purkin'je•shift" Pronunciation: [key] — Psychol. Psychol. the changes in perception of the relative lightness and darkness of different colors as illumination changes from daylight to twilight. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Purkinje fiber purl Related Content Daily Word Quiz: frugal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language