bridgeboard


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bridge·board

 (brĭj′bôrd′)
n.
A notched board at either side of a staircase that supports the treads and risers.

bridgeboard

(ˈbrɪdʒˌbɔːd)
n
(Building) a board on both sides of a staircase that is cut to support the treads and risers. Also called: cut string
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References in periodicals archive ?
My children had a whole bunch of fun playing "Bridgeboard." However, you need a bridgeboard to play this game.
Adding even more versatility is an optional Commodore product, the Amiga Bridgeboard, which allows applications running under MS-DOS or OS/2 to be accessed.
The cracking of bridgeboards popped in his ears like firecrackers, like gunfire, like a fist on a tight, leather punching bag.