ar·bo·ri·za·tion \ˌ ̷ ̷ ̷ ̷rə̇ˈzāshən, -ˌrīˈz-\noun (-s) 1.: formation of or into a figure or arrangement resembling a tree or shrub : ramification < the extent of the arborization of axons and dendrites > 2.: a treelike figure or arrangement of branching parts: as a.: an outline or impression of a tree or plant in fossils b.: demdrite 1 c.: a treelike process of a nerve cell < the terminal arborization of an axon >