/ Dictionary / Index M mortise joint: Meaning and Definition of Find definitions for: mor'tise joint" Pronunciation: [key] any of various joints between two pieces of timber or the like in which a tenon is housed in or secured to a mortise. Also called Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. mortise chisel mortise lock Related Content Daily Word Quiz: philtrum Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language