arborescˈent adjective

Growing, formed or branched like a tree

arˈboret noun

1. A shrubbery (obsolete)
2. An arboretum (obsolete)
3. A little tree, shrub (Milton)

arborēˈtum (or /är-bor-āˈtŭm/) noun (pl arborēˈta)

A botanic garden of trees and shrubs

arboriculˈtural adjective

arˈboriculture noun

The cultivation of trees, esp for ornamental and scientific purposes

arboriculˈturist noun

arˈborist noun

A person who studies trees

arborīzāˈtion or arborīsāˈtion noun

An arborescence

arˈborous adjective

Of, or formed by, trees

Arbor Day noun

In USA, Canada, Australia, New Zealand, etc, a day set apart every year for the general planting of trees

arbor vitae /vīˈtē or wēˈtī/ noun

1. (L, tree of life) an evergreen coniferous tree of the genus Thuja, related to cypress
2. The tree-like branching in the vertical cross-section of the human cerebellum (anatomy)