[ahr-bawr-ee-uhl, -bohr-]
of or pertaining to trees; treelike.
Also, arboreous. living in or among trees.
Zoology. adapted for living and moving about in trees, as the limbs and skeleton of opossums, squirrels, monkeys, and apes.

1660–70; < Latin arbore(us) of trees (arbor tree + -eus -eous) + -al1

arboreally, adverb
subarboreal, adjective Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arboreal (ɑːˈbɔːrɪəl)
1.  of, relating to, or resembling a tree
2.  living in or among trees: arboreal monkeys

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

1660s, from L. arboreus "pertaining to trees," from arbor "tree," of unknown origin, + -al (1).
Online Etymology Dictionary, © 2010 Douglas Harper
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American Heritage
Science Dictionary
arboreal   (är-bôr'ē-əl)  Pronunciation Key 
Relating to or living in trees.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Example sentences
The orangutan evidence adds a new twist to the debate of arboreal versus
  terrestrial bipedalism theories.
All sight hunters and arboreal creatures that jump from branch to branch have
  this, since they require stereo vision to survive.
The trails will take you through mossy forests to stunning, venerable arboreal
The orangutan is the only strictly arboreal ape and the largest tree living
  mammal in the world.
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