/ Dictionary / Index B backfill: Meaning and Definition of Find definitions for: back•fill Pronunciation: (bak'fil"), [key] — n. material used for refilling an excavation. —v.t. to refill (an excavation). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. backfield backfire Related Content Daily Word Quiz: vertigo Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language