a specialist in the cultivation and care of trees and shrubs, including tree surgery, the diagnosis, treatment, and prevention of tree diseases, and the control of pests.

1570–80; arbor3 + -ist Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arborist (ˈɑːbərɪst)
a specialist in the cultivation of trees

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

1570s, from L. arbor "tree," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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Example sentences
To avoid further damage to trees and property a professional arborist should be hired.
Consult an arborist if you are unsure about these care and maintenance practices.
However, be aware that the credentials of someone calling himself an arborist can vary widely.
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