arboreta

arboretum

[ahr-buh-ree-tuhm]
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.

Origin:
1830–40; < Latin arborētum a plantation of trees, equivalent to arbor tree + -ētum suffix denoting place where a given plant grows (cf. alameda)

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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
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Word Origin & History

arboretum
"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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