Definition of Pistan
Pis"ton (?), n. [F. piston; cf.
It. pistone piston, also pestone a large pestle; all fr.
L. pinsere, pistum, to pound, to stamp. See
Pestle, Pistil.] (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.
- Webster's Unabridged Dictionary (1913)
- A solid disk or cylinder that fits inside a hollow cylinder, and moves under pressure (as in an engine) or displaces fluid (as in a pump)
- (music) A valve device in some brass instruments for changing the pitch
- The Nuttall Encyclopedia
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