\Re*du"cing\ (r?*d?"s?ng),
a & n. from {Reduce}.
{Reducing furnace} (Metal.), a furnace for reducing ores.
{Reducing pipe fitting}, a pipe fitting, as a coupling, an
   elbow, a tee, etc., for connecting a large pipe with a
   smaller one.
{Reducing valve}, a device for automatically maintaining a
   diminished pressure of steam, air, gas, etc., in a pipe,
   or other receiver, which is fed from a boiler or pipe in
   which the pressure is higher than is desired in the
   receiver.