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arbor1

[ahr-ber] /ˈɑr bər/
noun
1.
a leafy, shady recess formed by tree branches, shrubs, etc.
2.
a latticework bower intertwined with climbing vines and flowers.
3.
Obsolete. a grass plot; lawn; garden; orchard.
Origin of arbor1
1350-1400
1350-1400; Middle English (h)erber < Anglo-French, Old French (h)erbier herbarium; respelling with -or under the influence of arbor3

arbor2

[ahr-ber] /ˈɑr bər/
noun
1.
Machinery.
  1. a bar, shaft, or axis that holds, turns, or supports a rotating cutting tool or grinding wheel, often having a tapered shank fitting tightly into the spindle of a machine tool.
    Compare mandrel.
  2. a beam, shaft, axle, or spindle.
2.
Metallurgy. a reinforcing member of a core or mold.
Origin
1650-60; respelling, by association with arbor3, of earlier arber, arbre < French, Old French < Latin arbor wooden beam or part in an olive press, tree

arbor3

[ahr-ber] /ˈɑr bər/
noun, plural arbores
[ahr-buh-reez] /ˈɑr bəˌriz/ (Show IPA).
Botany
1.
a tree.
Origin
1660-70; < New Latin, Latin: tree.
Related forms
arboresque, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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British Dictionary definitions for arbor

arbor1

/ˈɑːbə/
noun
1.
the US spelling of arbour

arbor2

/ˈɑːbə/
noun
1.
a rotating shaft in a machine or power tool on which a milling cutter or grinding wheel is fitted
2.
a rotating shaft or mandrel on which a workpiece is fitted for machining
3.
(metallurgy) a part, piece, or structure used to reinforce the core of a mould
Word Origin
C17: from Latin: tree, mast
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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Word Origin and History for arbor
n.

c.1300, herber, "herb garden," from Old French erbier "field, meadow; kitchen garden," from Latin herba "grass, herb" (see herb). Later "a grassy plot" (early 14c., a sense also in Old French), "a shaded nook" (mid-14c.). Probably not from Latin arbor "tree," though perhaps influenced by its spelling.

The change from er- to ar- before consonants in Middle English also reflects a pronunciation shift: cf. farm from ferme, harbor from Old English herebeorg.

Online Etymology Dictionary, © 2010 Douglas Harper
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arbor in Medicine

arbor ar·bor (är'bər)
n. pl. ar·bo·res (är'bə-rēz')
A treelike anatomical structure.

The American Heritage® Stedman's Medical Dictionary
Copyright © 2002, 2001, 1995 by Houghton Mifflin Company. Published by Houghton Mifflin Company.
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7
8
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