1 [ahr-ber]
Also, especially British, arbour.

1350–1400; Middle English (h)erber < Anglo-French, Old French (h)erbier herbarium; respelling with -or under the influence of arbor3 Unabridged


2 [ahr-ber]
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.
a beam, shaft, axle, or spindle.
Metallurgy. a reinforcing member of a core or mold.

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


3 [ahr-ber]
noun, plural arbores [ahr-buh-reez] . Botany.
a tree.

1660–70; < Neo-Latin, Latin: tree.

arboresque, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arbor1 (ˈɑːbə)
the US spelling of arbour

arbor2 (ˈɑːbə)
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
[C17: from Latin: tree, mast]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Word Origin & History

c.1300, herber, "herb garden," from O.Fr. erbier "kitchen garden," from L. herba "grass, herb" (see herb). Later "a grassy plot" (early 14c., a sense also in O.Fr.), "a shaded nook" (mid-14c.). Probably not from L. arbor "tree," though influenced by its spelling.
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Medical Dictionary

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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Example sentences
We require an infusion of hemlock, spruce or arbor vitae in our tea.
Imagine sipping your tea or wine in the dappled light of your own backyard
  arbor bench, your favorite vine overhead.
The arbor includes built-in light fixtures that illuminate the dining area and
  the fireplace.
In the rear lower garden, a custom steel rose arbor frames the view from the
Image for arbor
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