/ Dictionary / Index B brace jack: Meaning and Definition of Find definitions for: brace' jack" Pronunciation: [key] — Theat. Theat. a triangular piece of wood used for propping up scenery from behind. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. braced frame bracelet Related Content Daily Word Quiz: paradox Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language