/ Dictionary / Index F fiber bundle: Meaning and Definition of Find definitions for: fi'ber bun"dle Pronunciation: [key] — Optics. Optics. a flexible bundle of optical glass that transmits images. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fiberboard fibered Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language