ARBORETUM
arboretum, botanical garden
(noun) a facility where trees and shrubs are cultivated for exhibition
Source: WordNet® 3.1
Etymology
Noun
arboretum (plural arboretums or arboreta)
A place where many varieties of tree are grown for research, educational, and ornamental purposes.
Source: Wiktionary
Ar`bo*re"tum, n.; pl. Arboreta. Etym: [L., a place grown with trees.]
Definition: A place in which a collection of rare trees and shrubs is
cultivated for scientific or educational purposes.
Source: Webster’s Unabridged Dictionary 1913 Edition