Main definitions of arbor in US English:

: arbor1arbor2

arbor1

(British arbour)

noun

  • A shady garden alcove with sides and a roof formed by trees or climbing plants trained over a wooden framework.

    bower, alcove, grotto, recess, pergola, gazebo, summer house
    View synonyms

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’.

Pronunciation

arbor

/ˈɑrbər//ˈärbər/

Main definitions of arbor in US English:

: arbor1arbor2

arbor2

noun

  • 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. 1.1 A device holding a tool in a lathe.
      • ‘Technician A says unless the job is done with an arbor press the tone wheel is likely to become deformed.’
      • ‘Each shooter's tool kit contains loading dies, a small arbor press and a powder measure capable of being adjusted to throw precise charges.’

Origin

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

Pronunciation

arbor

/ˈɑrbər//ˈärbər/