/ Dictionary / Index D dietary fiber: Meaning and Definition of Find definitions for: di'etary fi'ber Pronunciation: [key] fiber (def. 9). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. dietary dietary law Related Content Daily Word Quiz: opulent Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language