/ Dictionary / Index F filamentary: Meaning and Definition of Find definitions for: fil•a•men•ta•ry Pronunciation: (fil"u-men'tu-rē), [key] — adj. pertaining to or of the nature of a filament. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. filament filamentous Related Content Daily Word Quiz: arboreal Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language