/ Dictionary / Index B bifilar: Meaning and Definition of Find definitions for: bi•fi•lar Pronunciation: (bī-fī'lur), [key] — adj. furnished or fitted with two filaments or threads. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: bifilar (Thesaurus) bifid biflagellate Related Content Daily Word Quiz: cetacean Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language