crankshaft

[krangk-shaft, -shahft]
noun Machinery.
a shaft having one or more cranks, usually formed as integral parts.

Origin:
1850–55; crank1 + shaft

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Collins
World English Dictionary
crankshaft (ˈkræŋkˌʃɑːft)
 
n
a shaft having one or more cranks, esp the main shaft of an internal-combustion engine to which the connecting rods are attached

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Etymonline
Word Origin & History

crankshaft
1854, from crank + shaft. The basic form of the mechanism appears to date from Roman times.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
Oil from the open crankshaft jetting up in his face, a hurricane of dirt thrown
  up on his skidding turns.
The wind turns the blades, which turns a crankshaft that creates mechanical
  power.
The small explosion that results pushes the piston down, turning the crankshaft
  and propelling the car.
His first attempt was a four-wheeled vehicle with a treadmill crankshaft
  between the rear wheels.
Image for crankshaft
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