/ Dictionary / Index M miter square: Meaning and Definition of Find definitions for: mi'ter square" Pronunciation: [key] an instrument for laying out miter joints, consisting of two straightedges joined at a 45° angle. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. miter saw miterwort Related Content Daily Word Quiz: exemplary Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language