from
The Collaborative International Dictionary of English v.0.48
Reducing \Re*du"cing\ (r?*d?"s?ng),
a & n. from {Reduce}.
[1913 Webster]
{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.
[1913 Webster]