connecting rod

noun Machinery.
a rod or link for transmitting motion and force between a rotating and a reciprocating part, as between a piston and a crankshaft.

1830–40 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
connecting rod
1.  a rod or bar for transmitting motion, esp one that connects a rotating part to a reciprocating part
2.  big end See also little end such a rod that connects the piston to the crankshaft in an internal-combustion engine or reciprocating pump
3.  a similar rod that connects the crosshead of a steam engine to the crank

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
As the piston rises in the cylinder, it is pushed harder to one side than the
  other by the angle of the connecting rod.
The connecting rod had small gritty particles on it along with grease or oil
It didn't take me long to decide to try it in that connecting rod.
The connecting rod contains a machining defect in the wrist pin bushing of the
  rod that could cause a seizure of the piston pin.
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