• (n.) A board or plank used as a bridge. • (n.) A notched board to which the treads and risers of the steps of wooden stairs are fastened.
An old Zorro expansion board developed by Commodore that contains an Intel processor for PC emulation. The only bridgeboard available at present is the GoldenGate Zorro card that allows the Amiga to use PC hardware, such as internal modems, if the driver software is available for it.
(from the article `marble`) ...or a hand`s span from them. In various pot games (a pot is a small hole in the ground), including moshie, the player tries to pitch his own ...
Bridge'board` noun 1. (Architecture) A notched board to which the treads and risers of the steps of wooden stairs are fastened. 2. A board or plank used as a bridge. 
In architecture, a bridgeboard is a notched board to which the treads and risers of the steps of wooden stairs are fastened.
a notched board serving as a string or carriage for a stair.