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Webster 1828 Edition

ppr.

Erecting a bridge; building a bridge over.

bridging

bridging ‎(not comparable)

bridging ‎(plural bridgings)

(architecture) The system of bracing used between floor or other timbers to distribute the weight.
- 1860, Thomas Leverton Donaldson, ‎William Cunningham Glen, Handbook of Specifications (page 319)
  All the joists and bridgings of the mezzanine floor to have stout double herringbone strutting not more than 6 feet apart.