/ Dictionary / Index F fiberize: Meaning and Definition of Find definitions for: fi•ber•ize Pronunciation: (fī'bu-rīz"), [key] — -ized, -iz•ing. to break or crack into fibers. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. fiberglass fiberoptic Related Content Daily Word Quiz: feline Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language