noun, plural arboretums, arboreta [ahr-buh-ree-tuh] .
a plot of land on which many different trees or shrubs are grown for study or display.

1830–40; < Latin arborētum a plantation of trees, equivalent to arbor tree + -ētum suffix denoting place where a given plant grows (cf. alameda) Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
arboretum (ˌɑːbəˈriːtəm)
n , pl -ta, -tums
a place where trees or shrubs are cultivated for their scientific or educational interest
[C19: from Latin, from arbor tree]

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Word Origin & History

"tree-garden," 1838, from L., lit. "a place grown with trees," from arbor "tree," of unknown origin.
Online Etymology Dictionary, © 2010 Douglas Harper
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