Bridge-board

bridgeboard

[brij-bawrd, -bohrd]
noun
a notched board serving as a string or carriage for a stair.

Origin:
1875–80; bridge1 + board

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World English Dictionary
bridgeboard (ˈbrɪdʒˌbɔːd)
 
n
Also called: cut string a board on both sides of a staircase that is cut to support the treads and risers

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