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