noun
piston
PIS-tuhn/ˈpɪstən/
A mechanical part that slides inside a cylinder to transmit force.
The entering liquid pushes the piston and its rod outward through the cylinder.
Etymology
A large pestle is a tool for pounding. Its repeated movement supplies the useful image behind the mechanical piston, which travels back and forth in a cylinder under pressure.
In context
the primary piston forward covering the compensating Port this action traps the fluid in the circuit chamber creating pressure and forcing fluid to the wheel brake units
More examples
- A worn piston can reduce an engine's power.
- Air pressure drives the piston forward.
- The hydraulic pistons lift the heavy platform.
Forms
piston · pistons
Similar words
- plunger
- Often pushes fluid directly, rather than transferring engine power.
- ram
- Usually applies a strong pushing force in hydraulic machinery.