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'.

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Word of the day astrogation
Pronunciation: ˌastrəˈgāSHən
noun
(in science fiction) navigation in outer space

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'.

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