arbor (a shady resting place in a garden or park, often made of rustic work or latticework on which plants, such as climbing shrubs or vines, are grown)
arboreal (relating to or resembling a tree)
arboreous (having many trees; wooded)
arbores (plural of arbor)
arborescent (having the size, form, or characteristics of a tree; treelike)
arboretum (a place where an extensive variety of woody plants are cultivated for scientific, educational, and ornamental purposes)
arborist (a specialist in the care of woody plants, especially trees)
arborization (a branching, treelike shape or arrangement, as that of the dendrite of a nerve cell)
arborize (to have or produce branching formations, as the bronchial tubes of the lungs)
arborvitae (any of several North American or eastern Asian evergreen trees or shrubs of the genus Thuja, having flattened branchlets with opposite, scalelike leaves and small cones)
Definitions are taken from:
The American Heritage® Dictionary of the English Language, Third Edition copyright © 1992 by Houghton Mifflin Company.
Electronic version licensed from InfoSoft International, Inc. All rights reserved.
Webster's Third New International Dictionary, Unabridged. Merriam-Webster, 2002.
https://unabridged.merriam-webster.com (30 Sep. 2006).
English-Word Information: Word Info about English Vocabulary (wordinfo.info).