Definition of arboretum noun from the Oxford Advanced Learner's Dictionary

 

arboretum

 noun
noun
BrE BrE//ˌɑːbəˈriːtəm//
 
; NAmE NAmE//ˌɑːrbəˈriːtəm//
 
(pl. arboretums, arboreta
BrE BrE//ˌɑːbəˈriː//
 
; NAmE NAmE//ˌɑːrbəˈriː//
 
)
 
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a garden where many different types of tree are grown, for people to look at or for scientific study Word Origin early 19th cent.: from Latin, ‘a place with trees’, from arbor ‘tree’.
See the Oxford Advanced American Dictionary entry: arboretum