/ ˌɑːbəˈriːtəm; NAmE ˌɑːrb-/ noun
( pl. ar·bor·etums or ar·bor·eta / -tə; NAmE /) a garden where many different types of tree are grown, for people to look at or for scientific study
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WORD ORIGIN
early 19th cent.: from Latin , a place with trees , from arbor tree.