/ Dictionary / Index M masking frame: Meaning and Definition of Find definitions for: mask'ing frame" Pronunciation: [key] easel (def. 2). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. masking masking piece Related Content Daily Word Quiz: censure Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language