ar·bor

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


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

00:10
Arbor is always a great word to know.
So is quincunx. Does it mean:
a fool or simpleton; ninny.
an arrangement of five objects, as trees, in a square or rectangle, one at each corner and one in the middle.
Dictionary.com Unabridged

ar·bor

2 [ahr-ber]
noun
1.
Machinery.
a.
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.
b.
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

ar·bor

3 [ahr-ber]
noun, plural ar·bo·res [ahr-buh-reez] . Botany.
a tree.

Origin:
1660–70; < Neo-Latin, Latin: tree.

ar·bo·resque, adjective
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Collins
World English Dictionary
arbor1 (ˈɑːbə) [Click for IPA pronunciation guide]
 
n
the US spelling of arbour

arbor2 (ˈɑːbə) [Click for IPA pronunciation guide]
 
n
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
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Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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Etymonline
Word Origin & History

arbor
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
The arbor-shaded patio with banco seating invites guests to the garden's far
  reaches.
Use to cover a fence or arbor or as a rough bank cover.
Imagine sipping your tea or wine in the dappled light of your own backyard
  arbor bench, your favorite vine overhead.
In the rear lower garden, a custom steel rose arbor frames the view from the
  house.
Image for arbor
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