/ Dictionary / Index F filiform: Meaning and Definition of Find definitions for: fil•i•form Pronunciation: (fil'u-fôrm", fī'lu-), [key] — adj. threadlike; filamentous. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: filiform (Thesaurus) filicide filigrain Related Content Daily Word Quiz: morose Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language