/ Dictionary / Index A arboretum: Meaning and Definition of Find definitions for: ar•bo•re•tum Pronunciation: (är"bu-rē'tum), [key] — pl. -tums, -ta a plot of land on which many different trees or shrubs are grown for study or display. Random House Unabridged Dictionary, Copyright © 1997, by Random House, Inc., on Infoplease. See also: arboretum (Thesaurus) arborescent arboriculture Related Content Daily Word Quiz: pugilist Analogy of the Day: Today’s Analogy Spelling Bee: Today’s Spelling Bee Frequently Misspelled Words Frequently Mispronounced Words Easily Confused Words Writing & Language