Definition of Piston
Pis´ton
n.
1.
(Mach.)
A
sliding
piece
which
either
is
moved
by
,
or
moves
against
,
fluid
pressure
.
It
usually
consists
of
a
short
cylinder
fitting
within
a
cylindrical
vessel
along
which
it
moves
,
back
and
forth
.
It
is
used
in
steam
engines
to
receive
motion
from
the
steam
,
and
in
pumps
to
transmit
motion
to
a
fluid
;
also
for
other
purposes
.
Piston head
(Steam Eng.)
that
part
of
a
piston
which
is
made
fast
to
the
piston
rod
.
Piston rod
a
rod
by
which
a
piston
is
moved
,
or
by
which
it
communicates
motion
.
Piston valve
(Steam Eng.)
a
slide
valve
,
consisting
of
a
piston
,
or
connected
pistons
,
working
in
a
cylindrical
case
which
is
provided
with
ports
that
are
traversed
by
the
valve
.
Related Words
composer
,
Walter
Piston
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