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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