1. Electronics.a sheet of insulating material used for the mounting and interconnection (often by a printed circuit) of components in electronic equipment.
a. board (def. 13a).
b. a piece of material on which printed or integrated circuits are installed. Also called board (for defs. 1, 2b).
Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease.