Definitions

from The American Heritage® Dictionary of the English Language, 5th Edition.

  • noun A short shaft that transmits motion from a motor to a machine, especially in an automobile.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

  • noun A common mechanical component used to transfer or synchronize rotational force in a machine.
  • noun A wheelless axle used to turn the wheels of a locomotive.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

jack +‎ shaft

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