Bridgeboard meaning

brĭjbôrd
A notched board at either side of a staircase that supports the treads and risers.
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Any of the notched boards holding the treads and risers of a staircase; string.
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(architecture) A notched board to which the treads and risers of the steps of wooden stairs are fastened.
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A board or plank used as a bridge.
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Origin of bridgeboard