piston rod

a rod communicating the rectilinear motion of a piston to the small end of a connecting rod or elsewhere.


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World English Dictionary
piston rod
1.  the rod that connects the piston of a reciprocating steam engine to the crosshead
2.  a less common name for a connecting rod

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The piston rod of the fluid knee control unit was connected at the bottom of
  the yoke.
Position the piston rod precisely under the loading device.
The actuators are similar to a large hydraulic cylinder with a piston and
  piston rod.
The piston is attached to a piston rod that connects to the crosshead that
  moves axially with the piston.
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