arboretum (n.)youdaoicibaDictYouDict[arboretum 词源字典]
"tree-garden," 1838, from Latin arboretum, literally "a place grown with trees," from arbor "tree," which is of unknown origin, + -etum, suffix used to form the names of gardens and woods.[arboretum etymology, arboretum origin, 英语词源]