There are 2 definitions of arbor in English:

arbor1

Syllabification: ar·bor
Pronunciation: /ˈärbər
 
/

noun

1An axle or spindle on which something revolves.
More example sentences
  • 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 indenter was secured into the arbor of a milling machine.
  • 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.
1.1A device holding a tool in a lathe.
More example sentences
  • 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.

Origin

mid 17th century: from French arbre 'tree, axis'. The spelling change was due to association with Latin arbor 'tree'.

Definition of arbor in:

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Word of the day anastrophe
Pronunciation: əˈnastrəfi
noun
the inversion of the usual order of words...

There are 2 definitions of arbor in English:

arbor2

Syllabification: ar·bor
Pronunciation: /ˈärbər
 
/
(British arbour)

noun

A shady garden alcove with sides and a roof formed by trees or climbing plants trained over a wooden framework.
More example sentences
  • We have a scented country garden and pond, water features, gravel gardens, arbours, pergolas, a summerhouse, many rare and unusual perennials, and 120 clematis.
  • They have planted a formal, yew encircled rose garden, with blue-painted pergolas and arbours, and have recently planted a gravel garden beside the sea road, with grasses, Verbena bonariensis, cistus, eryngiums and grasses.
  • The most popular garden structures, not counting the ubiquitous shed, include trellises, arbours and pergolas.
Synonyms
bower, pergola; alcove, grotto, recess; gazebo

Origin

Middle English (also denoting a lawn or flower bed): from Old French erbier, from erbe 'grass, herb', from Latin herba. The phonetic change to ar- (common in words having er- before a consonant) was assisted by association with Latin arbor 'tree'.

Definition of arbor in: