Definitions

from The American Heritage® Dictionary of the English Language, 4th Edition

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

from Wiktionary, Creative Commons Attribution/Share-Alike License

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

from the GNU version of the Collaborative International Dictionary of English

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

from The Century Dictionary and Cyclopedia

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

Etymologies

bridge +‎ board (Wiktionary)

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.

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