/ Dictionary / Index W window sash: Meaning and Definition of Find definitions for: win'dow sash" Pronunciation: [key] the frame holding the pane of a window. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Windows window seat Related Content Daily Word Quiz: perspicacious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language