bridgeboard

English

Etymology

From bridge +‎ board.

Noun

bridgeboard (plural bridgeboards)

1. (architecture) 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.

Synonyms

• (part of staircase): notchboard

Part or all of this entry has been imported from the 1913 edition of Webster’s Dictionary, which is now free of copyright and hence in the public domain. The imported definitions may be significantly out of date, and any more recent senses may be completely missing.
(See the entry for “bridgeboard”, in Webster’s Revised Unabridged Dictionary, Springfield, Mass.: G. & C. Merriam, 1913, →OCLC.)