Definition of countershaft
1 : a mechanism used to transmit motion and power from a main driving shaft to an individual machine, typically mounted by hangers on a ceiling, and driven by one belt from the main shaft and in turn driving the machine by another belt
2 : a short shaft in a machine (as an automobile) carrying intermediate gears to transmit motion usually with change of speed or direction or both from one set of gears to another
Love words? You must — there are over 200,000 words in our free online dictionary, but you are looking for one that’s only in the Merriam-Webster Unabridged Dictionary.
Start your free trial today and get unlimited access to America's largest dictionary, with:
- More than 250,000 words that aren't in our free dictionary
- Expanded definitions, etymologies, and usage notes
- Advanced search features
- Ad free!
Origin and Etymology of countershaft
counter- + shaft
Seen and Heard
What made you want to look up countershaft? Please tell us where you read or heard it (including the quote, if possible).