/ Dictionary / Index A arch brace: Meaning and Definition of Find definitions for: arch' brace" Pronunciation: [key] — Carpentry. Carpentry. a curved brace, esp. one of a pair used to give the effect of an arch in a roof frame. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. Archbp. archconfraternity Related Content Daily Word Quiz: cautious Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language