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

1850–55; crank1 + shaft Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
crankshaft (ˈkræŋkˌʃɑːft)
a shaft having one or more cranks, esp the main shaft of an internal-combustion engine to which the connecting rods are attached

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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Word Origin & History

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
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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