arboretum /ˌɑɚbəˈriːtəm/ noun plural arboretums or arboreta /-ˈriːtə/ /ˌɑɚbəˈriːtə/ plural arboretums or arboreta /-ˈriːtə/ /ˌɑɚbəˈriːtə/ Learner's definition of ARBORETUM
[count]
: a place where trees and plants are grown in order to be studied or seen by the public（所种植物供科研、观赏的）植物园