/ Dictionary / Index B back molding: Meaning and Definition of Find definitions for: back' mold"ing Pronunciation: [key] a molding, as a backband, applied to interior window and door trim to conceal the edge of the wall surface. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. back matter back-mutate 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