Source : Webster's Revised Unabridged Dictionary (1913)

Arborescent \Ar`bo*res"cent\, a. [L. arborescens, p. pr. of
   arborescere to become a tree, fr. arbor tree.]
   Resembling a tree; becoming woody in stalk; dendritic; having
   crystallizations disposed like the branches and twigs of a
   tree. ``Arborescent hollyhocks.'' --Evelyn.

Source : WordNet®

arborescent
     adj : resembling a tree in form and branching structure;
           "arborescent coral found off the coast of Bermuda";
           "dendriform sponges" [syn: {arboreal}, {arboreous}, {arboresque},
            {arboriform}, {dendriform}, {dendroid}, {dendroidal},
           {treelike}, {tree-shaped}]