Etymology
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arboreal (adj.)

1660s, "pertaining to trees," from Latin arboreus "pertaining to trees," from arbor, arboris "tree" (see arbor (n.2)) + -al (1). From 1834 as "living in or among trees."

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Definitions of arboreal

arboreal (adj.)
of or relating to or formed by trees;
Synonyms: arborical / arborary / arborous
arboreal (adj.)
inhabiting or frequenting trees;
arboreal apes
Synonyms: arboreous / tree-living
arboreal (adj.)
resembling a tree in form and branching structure;
Synonyms: arboreous / arborescent / arboresque / arboriform / dendriform / dendroid / dendroidal / treelike / tree-shaped
From wordnet.princeton.edu