"arboreal" in the adjective sense
1. arborical, arboreal, arborary, arborous
of or relating to or formed by trees
"an arborous roof"
2. arboreal, arboreous, tree-living
inhabiting or frequenting trees
"arboreal apes"
3. arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, treelike, tree-shaped
resembling a tree in form and branching structure
"arborescent coral found off the coast of Bermuda"
"dendriform sponges"
Source: WordNet® (An amazing lexical database of English)
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