Definitions

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

  • noun An intermediate shaft between the powered and driven shafts in a belt drive.

from The Century Dictionary.

  • noun A shaft driven by a band or gearing running from another opposite and parallel shaft.

from the GNU version of the Collaborative International Dictionary of English.

  • noun (Mach.) An intermediate shaft; esp., one which receives motion from a line shaft in a factory and transmits it to a machine.

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

  • noun A jackshaft.

Etymologies

from Wiktionary, Creative Commons Attribution/Share-Alike License

counter- +‎ shaft

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