[syn: arboreal, arboreous, arborescent, arboresque, arboriform, dendriform, dendroid, dendroidal, treelike, tree-shaped]
The Collaborative International Dictionary of English v.0.48:
Arboreous \Ar*bo"re*ous\, a. [L. arboreous, fr. arbor tree.]
   1. Having the form, constitution, or habits, of a proper
      tree, in distinction from a shrub. --Loudon.
      [1913 Webster]
   2. Pertaining to, or growing on, trees; as, arboreous moss.
      --Quincy.
      [1913 Webster]
WordNet (r) 3.0 (2006):
arboreous
    adj 1: inhabiting or frequenting trees; "arboreal apes" [syn:
           arboreal, arboreous, tree-living] [ant:
           nonarboreal]
    2: abounding in trees; "an arboreous landscape"; "violets in
       woodsy shady spots"; "a woody area near the highway" [syn:
       arboraceous, arboreous, woodsy, woody]
    3: resembling a tree in form and branching structure;
       "arborescent coral found off the coast of Bermuda";
       "dendriform sponges" [syn: arboreal, arboreous,
       arborescent, arboresque, arboriform, dendriform,
       dendroid, dendroidal, treelike, tree-shaped]