/ Dictionary / Index A arborist: Meaning and Definition of Find definitions for: ar•bor•ist Pronunciation: (är'bur-ist), [key] — n. a specialist in the cultivation and care of trees and shrubs, including tree surgery, the diagnosis, treatment, and prevention of tree diseases, and the control of pests. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arborist (Thesaurus) arborio arborization Related Content Daily Word Quiz: simian Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language