/ Dictionary / Index Z Zollner illusion: Meaning and Definition of Find definitions for: Zoll'ner illu'sion Pronunciation: (tsul'nur Ger. tsœl'nur), [key] — Psychol. Psychol. a spatial illusion in which parallel lines intersected by short oblique lines are perceived as converging or diverging. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Zollinger-Ellison syndrome Zollverein Related Content Daily Word Quiz: candor Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language