Source : Webster's Revised Unabridged Dictionary (1913)

Ribband \Rib"*band`\, n. [Rib + band.] [Written also riband, and
   ribbon.] (Shipbuilding)
   A long, narrow strip of timber bent and bolted longitudinally
   to the ribs of a vessel, to hold them in position, and give
   rigidity to the framework.

   {Rib-band lines}, oblique longitudinal sections of the hull
      of a vessel. --Knight.