Synonyms for Arboreal (same or very similar meaning)
WordNet sense 1 (of or relating to or formed by trees):
arborary, arborical, arborousWordNet sense 2 (resembling a tree in form and branching structure):
treelike, arborescent, dendroid, arboreous, arboresque, arboriform, dendriform, dendroidal, tree-shapedWordNet sense 3 (having many branches):
branchyWordNet sense 4 (inhabiting or frequenting trees):
tree-livingFrom the ODE community, based on WordNetadd/edit