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The Collaborative International Dictionary
Bridgeboard

Bridgeboard \Bridge"board`\, n.

  1. (Arch.) 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.

Wiktionary
bridgeboard

n. 1 (context architecture English) 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.