/ Dictionary / Index C circuit board: Meaning and Definition of Find definitions for: cir'cuit board" Pronunciation: [key] a sheet of insulating material used for the mounting and interconnection (often by a printed circuit) of components in electronic equipment. board (def. 13a). a piece of material on which printed or integrated circuits are installed. Also calledboard(for defs. 1, 2b). Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. circuit binding circuit breaker 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