/ Dictionary / Index P pincushion distortion: Meaning and Definition of Find definitions for: pin'cushion distor"tion Pronunciation: [key] — Optics. Optics. a distortion produced by a lens in which the magnification increases toward the edge of the field. Cf. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. pincushion cactus pincushion flower Related Content Daily Word Quiz: fabricate Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language