One of the mysteries of the English language finally explained.
- US spelling of arbour
1An axle or spindle on which something revolves.
- ‘The indenter was secured into the arbor of a milling machine.’
- ‘The third step is to mount the wheels on the arbors and to place these assemblies between the front- and backplates in such a way that the wheels and pinions mesh and turn freely.’
- ‘The bushing is secured in place by a solid arbor that passes through the front of the frame, through the middle of the bushing and is locked in place by the pivoting barrel and ejector rod.’
- 1.1 A device holding a tool in a lathe.
- ‘Each shooter's tool kit contains loading dies, a small arbor press and a powder measure capable of being adjusted to throw precise charges.’
- ‘Technician A says unless the job is done with an arbor press the tone wheel is likely to become deformed.’
Mid 17th century: from French arbre ‘tree, axis’. The spelling change was due to association with Latin arbor ‘tree’.
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