Definition of arboretum noun from the Oxford Advanced American Dictionary

 

arboretum

 noun
noun
NAmE//ˌɑrbəˈrit̮əm//
 
(pl. arboretums, (or )arboreta
NAmE//‑ˈrit̮ə//
 
)
 
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a garden where many different types of trees are grown, for people to look at or for scientific study
See the Oxford Advanced Learner's Dictionary entry: arboretum