piston rod

noun
a rod communicating the rectilinear motion of a piston to the small end of a connecting rod or elsewhere.
Origin:
1780–90

Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
piston rod
 
—n
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
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Piston rod is always a great word to know.
So is bezoar. Does it mean:
a calculus or concretion found in the stomach or intestines of certain animals, esp. ruminants, formerly reputed to be an effective remedy for poison.
the offspring of a zebra and a donkey.
LEARN MORE UNUSUAL WORDS WITH WORD DYNAMO...
Example sentences
There is no piston rod or main bearing, and all pressure on the crank is power
  producing.
Position the piston rod precisely under the loading device.
The piston is attached to a piston rod that connects to the crosshead that
  moves axially with the piston.
The piston rod of the fluid knee control unit was connected at the bottom of
  the yoke.
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