1.Definition: inhabiting or frequenting trees

"Arboreal apes"

Related Adjective(s):arboreous

2.Definition: of or relating to or formed by trees

Related Adjective(s):arborary, arborical, arborous

3.Definition: resembling a tree in form and branching structure

Related Adjective(s):arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, treelike