/ Dictionary / Index D double refraction: Meaning and Definition of Find definitions for: dou'ble refrac'tion Pronunciation: [key] — Optics. Optics. the separation of a ray of light into two unequally refracted, plane-polarized rays of orthogonal polarizations, occurring in crystals in which the velocity of light rays is not the same in all directions. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. double-reed double rhyme Related Content Daily Word Quiz: resilient Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language