/ Dictionary / Index F fiberboard: Meaning and Definition of Find definitions for: fi•ber•board Pronunciation: (fī'bur-bôrd", -bōrd"), [key] — n. a building material made of wood or other plant fibers compressed and cemented into rigid sheets. a sheet of this. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: fiberboard (Thesaurus) fiber fiber bundle Related Content Daily Word Quiz: penurious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language