Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A notched board at either side of a staircase that supports the treads and risers.

from The Century Dictionary.

  • noun One of the notched boards of a stair to which the ends of wooden steps and risers are fastened. Also called notch-board.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Arch.) A notched board to which the treads and risers of the steps of wooden stairs are fastened.
  • noun A board or plank used as a bridge.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun architecture A notched board to which the treads and risers of the steps of wooden stairs are fastened.
  • noun A board or plank used as a bridge.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

bridge +‎ board

Examples

  • There may be a jumper setting on the drive, or on the bridgeboard within the external housing you need to change that will allow you to access the entire drive.

    Discussions: Message List - root

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