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a plot of land on which many different trees or shrubs are grown for study or display.
Historical Examples

Well, to-morrow we can go to see them; in the arboretum at the foot of the big Monterey pine.
Insect Stories Vernon L. Kellogg

Including the arboretum, their total area did not then exceed 11 acres.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 Various

Besides the works above mentioned, see Louden, arboretum, ii.
Encyclopaedia Britannica, 11th Edition, Volume 13, Slice 5 Various

Hester met me at the station, and we walked through the arboretum to her home on the campus.
The Kempton-Wace Letters Jack London

The arboretum, or third section, includes twenty-five acres, and contains all kinds of ornamental and fruit trees.
Peculiarities of American Cities Willard Glazier

The final purchase was made largely in order that the arboretum might be able to start off with the Bixby collection as a nucleus.
Northern Nut Growers Association Report of the Proceedings at the Twenty-Fifth Annual Meeting Northern Nut Growers Association

To-day we arrived at Derby, and hastened to see its arboretum.
Letters of a Traveller William Cullen Bryant

A large proportion of the total acreage of the Gardens is monopolized by the arboretum.
Encyclopaedia Britannica, 11th Edition, Volume 2, Slice 4 Various

But the arboretum wanted a good many of those trees and so did we.
Northern Nut Growers Association Report of the Proceedings at the Twenty-Fifth Annual Meeting Northern Nut Growers Association

We made no use of this lovely day, except to walk to an arboretum and Pinetum on the outskirts of the town.
Passages From the English Notebooks, Volume 2 Nathaniel Hawthorne

noun (pl) -ta (-tə), -tums
a place where trees or shrubs are cultivated for their scientific or educational interest
n.

“tree-garden,” 1838, from Latin arboretum, literally “a place grown with trees,” from arbor “tree,” of unknown origin, + -etum, suffix used to form the names of gardens and woods.