/ Dictionary / Index B birefringence: Meaning and Definition of Find definitions for: bi•re•frin•gence Pronunciation: (bī"ri-frin'juns), [key] — n. Optics. See Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: birefringence (Thesaurus) birectangular bireme Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language