The Collaborative International Dictionary of English v.0.48:

Flowing \Flow"ing\, a.
   That flows or for flowing (in various sense of the verb);
   gliding along smoothly; copious.
   [1913 Webster]

   Flowing battery (Elec.), a battery which is kept constant
      by the flowing of the exciting liquid through the cell or
      cells. --Knight.

   Flowing furnace, a furnace from which molten metal, can be
      drawn, as through a tap hole; a foundry cupola.

   Flowing sheet (Naut.), a sheet when eased off, or loosened
      to the wind, as when the wind is abaft the beam. --Totten.
      [1913 Webster]